The formation of the internal ear is a complex process that involves the development of a variety of structures in a specific order. The correct order of development, from earliest to form to latest, is otic placodes, otic pits, and otic vesicles. So the correct option is B.
Otic placodes first appear during the fourth week of embryonic development. These are small thickenings on the surface of the head that will eventually develop into the inner ear structures. During the fifth week of development, otic pits begin to form, which are small depressions in the otic placodes. These will eventually form the inner ear, including the semicircular canals, cochlea, and vestibule. Finally, during the sixth week of development, the otic vesicles form from the otic pits. These vesicles will become the cochlear duct, vestibular duct, and the utricle and saccule.
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In a municipal wastewater treatment plant, the primary treatment step includes ________
Step includes the physical processes of screening, crushing, sand separation, and sedimentation.
In many developed countries, primary treatment is the minimal pretreatment required for sewage irrigation. If the wastewater is used for irrigation of crops not consumed by humans or for irrigation of orchards, vineyards and some processed food crops, this can be considered sufficient treatment. However, to avoid potential disruption of reservoirs and flow-regulating reservoirs, some form of secondary treatment is usually required in these countries, even for irrigation of non-food crops. If off-line storage is envisaged, it may be possible to use at least part of the primary wastewater for irrigation.
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Template Strand: AGG
mRNA:
tRNA:
Amino Acid:
Template Strand: CTAGCT
mRNA:
tRNA:
Amino Acid:
The template strand is AGG, so the mRNA is UCC, and the amino acid is serine. The template strand is CTAGCT, the mRNA is GAUCGA, and the polypeptide chain is Val-Arg.
What is the codon?The codon is present on the mRNA, which is three consecutive nucleotides, and depending upon this, the amino acids are joined to make the polypeptide chain, and the mRNA is made from the DNA template strand.
Hence, the template strand is AGG, so the mRNA is UCC, and the amino acid is serine. The template strand is CTAGCT, the mRNA is GAUCGA, and the polypeptide chain is Val-Arg.
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Which of the following research questions would best guide an investigation of the link between the single cellular bacteria and multicellularity?
A.) Do bacteria always perform quorum sensing, or is there a threshold value for the required concentration in order for an elicited response to occur?
B.) Is the rate of signaling molecule collisions impacted by temperature and concentration?
C.) How does the chemical structure of ancestral bacterial signaling molecules and their receptors compare to those of eukaryotic organisms present today?
D.) Can eukaryotic organisms communicate through local and distance signaling mechanisms?
Can eukaryotic organisms communicate through local and distance signaling mechanisms is a research question that might guide an investigation of the link between single cellular bacteria and multicellularity (Option D).
What is a question in science?Raising a question is a fundamental part of science since allows us to connect observations that a priori might seem separate, and then we need to formulate a plausible explanation of the hypothesis to prove this link.
Therefore, with this data, we can see that a question is a fundamental step in science before the formulation of the hypothesis.
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using colony monitoring devices to evaluate the impacts of land use and nutritional value of forage on honey bee health
These devices monitor parameters relevant to colony health at frequent intervals, frequently approximating real time.
Further relationships between the fine-scale record of hive state and static or dynamic landscape characteristics, such as weather, climate, colony density, land use, pesticide use, plant class, and fodder quality, are possible. Both beekeepers and researchers are increasingly using colony monitoring tools to check and evaluate the health status of honey bees. Equipped two apiaries with commercial honey bee colonies to track the utilisation of floral resources, the quality of the pollen, and the production of honey. A low-intensity agricultural area housed one apiary, whereas a high-intensity agricultural area housed the other.Scales recorded weight every 15 minutes during the growing season while pollen traps were open for 72 hours every two weeks. Forage yield per day, species identity using DNA sequencing, pesticide residues, amino acid content, and total protein content from collected pollen which affect the health of honeybee. Calculated the cumulative hive weight change over the growing season using scales, which is related to honey output and the final colony weight entering winter. Additionally, hive scales can be used to detect environmental pollen and nectar shortages for honey collection and monitor phenological changes in plant populations.To know more about health check the below link:
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What is true about human samples from a body
The true statement about human samples from a body is hair samples can be different even when taken from the same person. The correct option is d.
What is hair?A hair sample is often obtained from a person's head and consists of a collection of hair strands. Hair from the previous year is commonly found in hair samples.
Despite the fact that hair growth varies, an average of 5 inches of hair is added in 12 months. These characteristics, as well as hair's resistance to water and stretching, all have an impact on how it looks on a regular basis.
Therefore, the correct option is d, Hair samples can be different even when taken from the same person.
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The question is incomplete. Your most probably complete question is given below:
Hair morphology stays the same as an individual gets older.
Every hair taken from the same scalp has matching physical characteristics.
Physical properties can be used to most accurately individualize hair.
Hair samples can be different even when taken from the same person
Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol prevents microtubule depolymerization (breaking down). Thus, Taxol stops mitosis by interfering with which of the following structures or processes?
a) The mitotic spindle.
b) Cytokinesis.
c) DNA replication.
d) Chromosome condensation.
Taxol stops mitosis by interfering with the mitotic spindle.
What is taxol ?Taxol, an antimitotic drug used to treat cancer, inhibits the growth of cancer cells by preventing cell division, which leads to cell death.
Taxol irritates the skin. A chemical that can inflame the vein through which it is administered is called an irritant. Damage to tissue may result from medication that escapes from the vein. The nurse or doctor who administers Taxol needs to undergo thorough training.
Among the causes of weight increase in chemotherapy patients are: The body may retain more fluid as a result of swelling (edema) brought on by chemotherapy. Lymphedema or fluid retention are other names for this. During chemotherapy, your appetite may increase, or you may experience nausea before feeling better after eating.
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ncrna structure and function the function of an ncrna depends largely on its ability to bind to other (click to select) . some ncrna molecules bind to proteins or small molecules due to (click to select) . other ncrna molecules may bind to rna or dna due to (click to select) . to function as a (click to select) , the structure of an ncrna molecule must form binding sites for several molecules.
The function of all ncRNAs structure depends largely on its ability to bind to other molecules.
Non-coding RNA (ncRNA) is a molecule of functional RNA that is not translated into a protein. An RNA gene is the DNA sequence from which a functional non-coding RNA is transcribed. Transfer RNAs (tRNAs) and ribosomal RNAs (rRNAs) are abundant and functionally important types of non-coding RNAs, as are small RNAs such as microRNAs, siRNAs, piRNAs, snoRNAs, snRNAs, exRNAs, scaRNAs, and long ncRNAs such as Xist and HOTAIR.
Non-coding RNAs (ncRNAs) regulate gene expression through transcription and post-transcriptional mechanisms. Some noncoding RNAs (ncRNAs) appear to be involved in epigenetic processes. They have been shown to be involved in the formation of heterochromatin, histone modification, DNA methylation targeting, and gene silencing.
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Stress-induced catecholamine release from the adrenal medulla may result in:a. decreased blood flow to the brain.b. elevated blood pressure.c. decreased glycogen synthesis.d. decreased muscle contraction.
The correct option is A ; decreased blood flow to the brain Reduced blood supply to the brain deprives cells of nutrition, which soon leads to cell dysfunction.
Symptoms of a stroke develop when a portion of the brain ceases to function. During a stroke, the blood supply to the brain is nearly totally cut off, and the cells die within five minutes.
A variety of disorders can restrict or halt blood flow at the back of the brain. Smoking, high blood pressure, diabetes, and a high cholesterol level are the most prevalent risk factors. These are the same risk factors for any stroke..
Catecholamines have rapid effects such as constricting blood vessels in the skin. Increasing the amount of glucose in your bloodstream. Boosting your cardiac output.
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What directly causes an action potential in the cochlear duct?
Answer:
An action potential is triggered in the neuron that synapses with the hair cell when Ca2 enters the area, stimulating the release of neurotransmitter by the hair cell. The cochlear nerve, which transmits the action potential to the brain's auditory cortex, is made up of the axons of these neurons.
Explanation:
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An action potential is triggered in the neuron that synapses with the hair cell when Ca2+ enters the area, stimulating the release of neurotransmitter by the hair cell.
What are neuron?Neuron are defined as the basic building blocks of the brain and nervous system, the cells in charge of taking in sensory information from the outside world, giving motor instructions to our muscles, and converting and relaying electrical signals at each stage in between. Based on function, they can be divided into three basic classes. Interneurons, motor neurons, and sensory neurons make up this group.
These neurons' axons make up the cochlear nerve, which sends the action potential to the brain's hearing cortex. The cochlear nerve experiences an action potential when the hairs are pushed slightly because their tips are lodged in the immobile tectorial membrane.
Thus, an action potential is triggered in the neuron that synapses with the hair cell when Ca2+ enters the area, stimulating the release of neurotransmitter by the hair cell.
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What causes a supernova?
a) the collision of several small stars that forms a new giant star
b) the collapse of a giant cloud of gas and dust in a nebula
c) the expansion of a shell of gas around a star that creates a giant star
d) the collapse of the core of a high-mass stat
Answer:
When the pressure drops low enough in a massive star, gravity suddenly takes over and the star collapses in just seconds. This collapse produces the explosion we call a supernova. Supernovae are so powerful they create new atomic nuclei.
Answer:
The collapse of the core of a high-mass star
Explanation:
One type, called a “core-collapse” supernova, occurs in the last stage in the life of massive stars
10. Which one of the following does not produce carbon dioxide? a. a muscle fibre c. a nerve cell b. saliva C. semen
Answer: C. a nerve cell
Explanation: nerve cells do not produce Carbon Dioxide. Nerve cells produce action potentials
An important technological advance that allowed scientists to decipher the genetic code was the ability to...
Answer:
Before the genetic code could be deciphered, before scientists could understand the process by which deoxyribonucleic acid (DNA) directed the synthesis of proteins, they had to resolve a final mystery: as Francis Crick and other researchers insisted, there must be a messenger to transmit genetic information from the cell nucleus to the cytoplasm, a messenger that was almost certainly made of ribonucleic acid (RNA). But what was its exact nature? Scientists had found notable amounts of RNA at the ribosome, the site of protein synthesis in the cytoplasm, and had assumed that this RNA was the postulated messenger. Each ribosome, according to this assumption, synthesized just one protein.
However, the assumption that ribosomal RNA (rRNA) was the messenger conflicted with other findings, namely that the main sections of rRNA occurred in only two lengths, whereas the polypeptide chains for which this RNA supposedly coded differed greatly in length; and secondly, that the relative amounts of the bases in rRNA were fairly constant, whereas their relative amounts in DNA varied widely from species to species. (The sequence of the bases in rRNA, as opposed to the relative amounts of its bases, would not be known for several more years.) Moreover, Arthur Pardee, François Jacob, and Jacques Monod in their famous "PaJaMo-experiment" had produced evidence that protein synthesis commenced soon after the introduction of a gene into a cell and that it proceeded at a fast, steady rate. By contrast, the theory that ribosomal RNA was the messenger predicted that protein synthesis would start up gradually, as the newly-introduced gene first had to produce the ribosomes at which protein synthesis was to occur.
If ribosomal RNA could not be the messenger, then what was? The question was resolved during a decisive meeting at King's College, Cambridge, on Good Friday, 1960, between Jacob, Sydney Brenner, Crick, and a handful of other researchers. A few years earlier, in 1956, two scientists working with a virus that infected a bacterium found in the bacterium small amounts of a form of ribonucleic acid (RNA) that had the same base composition (the same proportion in the amount of bases) as the DNA of the virus. Their finding and its significance had remained unexplained. During the meeting, Brenner had the sudden insight that this form of RNA must be the messenger because it replicated the base composition of the virus, not of the infected bacterium or its ribosomes, where virus-directed synthesis of proteins was unfolding. Messenger RNA (mRNA) was found in such small amounts that it had previously eluded detection because it was needed only for short periods of time during protein synthesis. It then degraded, to be used again in making a copy of another stretch of DNA. Brenner and the others concluded that the ribosome was just an inert reading head that could synthesize any type of protein while it traveled along the messenger RNA, reading off the bases in sequence.
With the basic concepts of genetic control of protein synthesis in place, what remained to be explained was how the genetic code worked, that is, how genetic information was transcribed from DNA to messenger RNA to protein. In an article published in Nature on December 30, 1961, Crick, Brenner, and their team described how, by inducing successive mutations in a virus that attacks the bacterium Escherichia Coli, they obtained evidence that the chemical code embodied in a gene consisted of groups of three bases which do not overlap, or share bases. The mutants studied were acridine mutants, meaning they had been exposed to the potent mutagen proflavine, a bright yellow dye derived from the coal tar chemical acridine. As Crick correctly surmised, acridines slip in and out between the bases of the virus RNA (the virus they studied was of RNA, not DNA), leading to the insertion or deletion of a base on the complementary chain during gene replication. Such insertion or deletion of a base in the viral RNA led to a "phase shift": given that, according to the sequence hypothesis, the sequence of the bases was to be read in linear fashion, from a fixed starting point and in one direction, the addition or deletion of a base would throw the reading of the base sequence out of step (out of phase) from the point of mutation onward. Consequently, proteins synthesized from viral RNA past the point of mutation were deformed, and could not perform their usual functions; the virus the team worked with was rendered less infectious, as could be determined by observing the bacterial cultures on which it preyed in the Petri dish.
Heterozygous and homozygous short
_____ x _____
genotypic ratio: ____ : ____ : ____
phenotypic ratio: ____ : ____
What is the probability of having a homozygous short plant? _____
If we denote the recessive allele of the gene as p and the dominant allele as P, the offspring will be of phenotypic ratio 3:1 those with chlorophyll to those without chlorophyll respectively.
What is the percentage of genotype?Genotypically, 25% would be homozygous for dominant allele, 50% heterozygous and 25% homozygous recessive. See attached punnet square.
A number of plant species have a recessive allele for albinism homozygous albino individuals are unable to synthesize chlorophyll. If a heterozygous tobacco plant is allowed to self-pollinate and 500 of its seeds germinate.
Therefore, If we denote the recessive allele of the gene as p and the dominant allele as P, the offspring will be of phenotypic ratio 3:1 those with chlorophyll to those without chlorophyll respectively.
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a 92% decline in irrigated crop productivity by 2100 and decreasing drinking water supplies will adversely affect .
sustainable water resource management can lead to a worsening of shelter hygiene (humidity, insects, rodents).
What happens if there is an inadequate supply of water?Access to clean water for drinking and performing basic hygiene at home, in schools, and in healthcare institutions is hampered by a lack of water. Water scarcity can cause sewage systems to malfunction and an increase in the risk of getting illnesses like cholera. Water that is hard to obtain by also costs more.The absence of sustainable water resource management can lead to a worsening of shelter hygiene (humidity, insects, rodents), or even to their destruction, which can potentially affect entire populations (in the event of floods or landslides for example) (in the case of floods or landslides for example).To learn more about sustainable water resource refer,
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Explain why different diets that vary greatly in the amount of carbohydrates, fats, and
protein can all be healthy diets despite the protein needs of the body.
Answer: Depending on the goal of the diet, the intake of carbohydrates, protein and fat will not be the same
Explanation:
If you want to lose weight, you will consume less calories than your body needs. So depending on your goals, you will not consume the same amount of protein, carbohydrates or fat. Ps: you get 4 calories in 1 gram of carbohydrates or protein, 9 calories in 1 gram of fat.
2. What is the meaning of yellow on a hazmat diamond?
a. Signifies chemical reactivity hazard
b. Signifies flammability hazard
c. Signifies nuclear hazard
The color-coded diamond yellow signifies reactivity hazard which helps in signaling the degree of health hazard.
What are hazard diamonds?
The NFPA hazard diamonds are used for identifying the s[ecific hazards of a material and severity of the hazard that occurs during an emergency.
This system has four quadrants in which numbers are used in upper three quadrants to signal the degree of health hazard.
Blue - Degree of health hazardRed - Flammability hazardYellow - reactivity hazardWhite - Specific hazardThese three diamonds lie between 0 and 4. A score of zero indicates there is no danger. A score of 4 means there is the worst possible danger.
The yellow diamond tells about the reactivity: how fast the compound reacts with other materials (Example: some chemicals like ammonium nitrate explode on touch with water).
Hence, the meaning of yellow on a hazmat diamond signifies chemical reactivity hazard.
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rubisco can bind to co2 or o2 in the calvin cycle. after learning this, a student was interested in photorespiration
Carbon dioxide is easily excluded in proteins that bind oxygen, such as myoglobin, due to its slight size difference. However, in rubisco, an oxygen molecule can easily bind in the location intended to bind to carbon dioxide. The oxygen is then added by Rubisco to the sugar chain, creating an improperly oxygenated product.
What is Photorespiration ?The oxidative photosynthetic carbon cycle, also known as the C2 cycle or photorespiration, is a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis.
RuBisCO aids in the Calvin-Benson cycle's CO2 fixation (carboxylation), but it also fixes O2. The latter reaction is where photorespiration begins.
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both klebsiella pneumoniae and streptococcus pneumoniae avoid phagocytosis by releasing a-b toxins that kill leukocytes. T/F
False, By producing A-B antigens that kill leukocytes, Klebsiella pneumoniae & Streptococcus pneumoniae both escape phagocytosis.
By releasing elastase during pneumolysin-dependent neutrophil lysis, Streptococcus pneumoniae compromises the pulmonary immune system.
An inflammatory lung illness called pneumonia is a major cause of morbidity and death around the globe. It is brought on by microbes such as bacteria, viruses, fungi, or others. The most frequent cause of pneumonia is a gram-positive bacteria with over 90 different serotypes called Streptococcus pneumoniae.
They destroy the phagocyte by causing the lysosomes to release their contents into it. They stop the lysosome & phagosome from merging.
A few strains of Streptococcus pneumoniae are antibiotic-resistant. Treatment failures may result from resistance.
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list the five assumptions of the hardy-weinberg equilibrium principle. describe why the principle was or was not supported by the model population.
Basic Hardy-Weinberg hypotheses include the absence of mutation, chance mating, the absence of gene flow, the existence of an infinite population, and the absence of selection. For a gene, the population may evolve for that gene if the presumptions are not true.
What are the Hardy-Weinberg principle's five guiding principles, and why are they crucial?Under the suppositions of no mutation, no migration, no selection, random mating, and infinite population size, Hardy-Weinberg Equilibrium (HWE) is a null model of the relationship between allele and genotype frequencies, both within and between generations.
What makes the Hardy-Weinberg model unreliable?The Hardy-Weinberg equilibrium can also be changed through gene flow, which happens when two populations reproduce and introduce new alleles into one another. The Hardy-Weinberg equilibrium exists because all of these disruptive factors frequently occur in nature.
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How Many body openings are present in the Cnidarian? The Nematode?
There is a single body opening in cnidarians whereas two openings in nematodes
This single body opening acts as both mouth and anus for the organism.
This opening in cnidarians leads to a space known as a gastrovascular cavity. All the food entered through the mouth is digested in this cavity.
When the food enters through the mouth, it leads a passage to the cavity, and all the digestive enzymes act on the food. Any parts of the food which is not digested are expelled from the body through this opening only
This type of digestion can be easily seen in jellyfish
In nematodes, the mouth part is located on the anterior side of the worm, and the anus is on the posterior side. The food is engulfed by the mouth and goes to the alimentary canal where it gets digested. The undigested food particles are expelled from the body through the anus by excretion.
This can be seen in Ascaris.
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A reproduction cell has _ the number of chromosomes as a _ cell
To understand the structure of eukaryotic DNA, rank the following from least to most condensed. Rank the options below. double-stranded DNA supercoiled chromatin condensed chromatin nucleosome chromatin chromosome
The following eukaryotic chromatin compaction levels in order of least to most compact. Nucleosome, selenoid, loop domains, chromatid, bare DNA, metaphase chromosome
What are chromosomes and what do they do?The thread-like chromosomes that convey the genetic data from cells to cells are formed of proteins and a single DNA molecule. Chromosomes are located in the nucleus of organisms in both plants and animals, including humans.
What does a human chromosome do?Long segments of DNA are carried by chromosomes, which are organelles that can be found in the nucleus of cells. The substance that houses genes is called DNA. It serves as the foundation for the human body. Additionally, proteins found in chromosomes aid in the appropriate structure of DNA.
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how would urbanization impact the carbon cycle
Urban residents currently control ∼22 (12–40)% of the land carbon uptake (112 PgC/yr) and ∼24 (15–39)% of the carbon emissions (117 PgC/year) from land globally. Urbanization resulted in the creation of new carbon pools on land such as buildings (∼6.7 PgC) and landfills (∼30 PgC).Jan 11, 2016
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which of the following is an encryption hash function used by security analysts to ensure that two files are exactly the same? 5dm m2d md5 md2
Security experts use the MD5 encryption hash method to verify if two files are identical.
A cryptographic system called MD5 is used for digital signatures, content verification, and message authentication. The hash algorithm used in MD5 confirms that the document you sent and the recipient both received the same file.
A string of any length may be turned into an MD5 hash by encoding it into a 128-bit fingerprint. The identical 128-bit hash output will always be produced when encoding the very same string with the MD5 method.
This hash is a little trickier since it includes a salt, a randomized string of information that is added to a password before it is hashed and saved.
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Sort the phrases based on whether they describe or give an example of facilitated diffusion, active transport, or both.1) Movement to area of lower concentration2) Movement assisted by proteins3) Requires energy4) Sodium ion transport out of the cell5) Glucose transport into cell6) Movement across a membrane
The characteristic of facilitated diffusion is movement to a area of lower concentration (1) which assisted by proteins (2)), for example glucose transport into cell (5). While active transport is the movement which require energy (3), for example, sodium ion transport out of cells (4). Both of them are the movement across a membrane (6).
The cell membrane regulates the movement of particle in and out of cells. In terms of the concentration gradient and energy, there are some types of movement. Passive movement is a type of movement from high concentration to lower concentration so that doesn’t require energy in form of ATP. For example, osmosis and diffusion. Specially for facilitated diffusion, the movement is assisted by proteins. However the solute is moving down the concentration gradient. A transport of glucose into cells is through a facillitated diffusion.
Conversely, an active transport needs energy from respiration because the movement against the concentration gradient. For example, the sodium ion transport out of the cells.
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How many germ (cell) layers are present in acoelomates?
Answer:
Acoelomates are animals that lack a body cavity, or coelom, and are characterized by having all of their internal organs packed closely together. Because of this, they do not have distinct germ layers, which are the three primary tissue layers that form during embryonic development in animals with a coelom. These three germ layers are the ectoderm, mesoderm, and endoderm, and they give rise to the different tissues and organs in the body. In acoelomates, there is no distinct separation of these tissue layers, so it is not possible to say how many germ layers are present.
The abbreviation (MBC/MIC/MID) stands for the smallest amount of a drug that will inhibit the growth and reproduction of a pathogen. (Be sure to use all capital letters.)
The term "MIC" refers to the least dose of a medicine needed to stop a pathogen's growth and reproduction.
Describe a pathogen as an example.Pathogens, which can affect one's health, include bacteria, fungus, viruses, and parasites. There are numerous pathogens that can cause severe illnesses, such as anthrax, HIV, Epstein-Barr viral, and the Zika virus.
In what ways does a pathogen impact the body?Numerous methods are used by pathogens to sicken their hosts. The most straightforward method is by direct tissue or cell damage during replication, typically through the generation of toxins, which permits the virus to enter other tissues or leave the cells it replicated in.
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The cells undergoing Mitosis are called ___________ cells while the cells undergoing Meiosis are called ______________ cells
Answer:
The cells undergoing mitosis are called body cells while the cells undergoing meiosis are called sex cells
single-cell atlas of early human brain development highlights heterogeneity of human neuroepithelial cells and early radial glia
Yes, a single-cell atlas of early human brain development can highlight the heterogeneity of human neuroepithelial cells and early radial glia.
Single-cell atlases are powerful tools for gaining insights into complex cellular dynamics and uncovering subtle cellular differences. By capturing single-cell transcriptomics data from early human brain development, a single-cell atlas can reveal the heterogeneity of human neuroepithelial cells and early radial glia, along with the precise molecular mechanisms that control their development.
This information can then be used to further understand the differences between the cells, and how they may contribute to the development and maturation of the brain.
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Which of the following is an example of an "autotroph"? A. Deer B. Shark C. Human D. Grass