Answer:
refractory period
Explanation:
refractory period is a period of time during which an organ or cell is incapable of repeating a particular action
A student made a list of structures are observed in cells from two different organisms which statement describes the most likely difference in the way that organism one and organism two obtain energy
PLEASE HELP ME IM TIMED!
Answer:
Lipids
Explanation: I take 9th grade biology
how is the reproduction of bryophytes similar to that of ferns?
Answer:
see below
Explanation:
Reproduction relies on water so that sperm can swim to the egg. Breophytes and ferns both have sperm. ... Ferns require water for the sperm to swim, but breophytes the sperm are released directly on the feralization site, and don't need to swim.
X-Ray are and example of electromagnetic radiation?
True or false
Answer:
True
Explanation:
Answer: true
Explanation:
During meiosis, the cells that are created are used during
a. regeneration of new tissue
b. regeneration of worn out cells
c. fertilization
d. cytokinesis
e. more than 1 answer is correct
Answer:
C
Explanation:
because fertilization is the fusion of male gamete and female gamete that arises from meiosis
According to the punnet square, what is the ratio of the offspring genotypes?
A. 1:2:1
B. 3:2:1
C. 4:3:2
The viral envelope closely resembles the ______________________. a. prokaryotic cell wall. b. capsomere c. eukaryotic cytoplasmic membrane. d. eukaryotic cell wall.
The viral envelope closely resembles the eukaryotic cell wall. That is option D.
The virus is a type of microorganism that contains DNA (Deoxyribonucleic acid) and surrounded by a protein coat.
There are different types of viruses which include:
Double stranded DNASingle stranded DNADouble stranded RNASingle stranded RNAThe parts of a virus include:
the protein coat (viral envelope)DNA (Deoxyribonucleic acid)The viral envelope is the external part of the virus, which is made up of proteins and lipids, and is capable of protecting the virus from harm.
Also the cell wall of the eukaryotic cell wall also protects these organisms from external harm.
Therefore, the viral envelope closely resembles the eukaryotic cell wall.
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if woman can not have children does that mean that she does not have all the property of life and is therefore not alive
Secondary nucleus is
a) Haploid
b)Diploid
c) Triploid
d) Tetraploid
The correct answer is option B. Diploid
The secondary nucleus is formed by the fusion of two polar nuclei which is a diploid.
Meiosis is the process that produces haploid gametes from diploid cells in the gonads. As a diploid cell progresses through the stages of meiosis I and meiosis II, at what point do the cells first become haploid
Answer:
A
Explanation:
Meiosis occurs in two phases. Meiosis I is the reductive phase, while meiosis II is non-reductive. The point at which the cells first become haploid is at the end of meiosis I, after homologous chromosomes separate.
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Through Meiosis, a diploid cell (2n) produces four haploid daughter cells (n).
After DNA replication there are two meiotic phases.
The first one is a reductive phase, in which homologous chromosomes separate. In the second phase, the cell suffers a new, not reductive division.1. In the first phase, Meiosis I:
Prophase I: Chromosomes condensate and become visible. Occurs crossing-over between homologous chromosomes. Crossin-over makes the daughter cells to be genetically different from the original one. Metaphase I: Homologous chromosomes randomly align in the equatorial plane. Anaphase I: In this phase occurs the division and independent separation of homologous pairs. Each chromosome migrates to different poles. This separation generates different chromosomal combinations in the daughter cells.Telophase I: Chromosomes of homologous pairs are already in the corresponding poles, and the nuclear membrane forms again in each pole.
Cytokinesis occurs
2. In the second phase, Meiosis II:
Prophase II: Chromosomes condensate again and become visible. Metaphase II: Chromosomes join the spindle apparatus and migrate to the equatorial plane, where they randomly line up. Sister chromatids are holden together until they reach the Anaphase. Anaphase II: Centromeres divide, chromatids get separated, and each of them goes forward an opposite cellular pole. Telophase II: Once in the poles, the chromosomes become lax again, and the nuclear membrane forms again.Cytokinesis occurs.
To answer this question, focus your attention on Meiosis I. During the anaphase homologous chromosomes separate. After this point, the nuclear membrane forms in the telophase, followed by cytokinesis. The result is two haploid cells.
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why is it important for gametes to be haploid jiskha
Answer:
its important for gametes to be haploid so when fusion of the Male and female gametes take place after fertilization the correct amount of chromosome numbers specific to the species can be restored
It is important for gametes to be haploid as just to maintain the chromosomal number. It is present for the sake of incorporation of both of the sets of chromosome in the progeny.
What is the number of chromosomes in humans ?It is having 23 pairs of chromosomes that is having total of 46 chromosomes.
Because meiosis just creates cells which are destined to be the gametes and in this reduction in the chromosome number is just critical that is without the process, the union of the two gametes that are during the fertilization that will result in the offspring with just twice of normal number of the chromosomes.
Haploid cells in the humans are just produced out by meiosis. This is type of the cell division in which the single diploid parent cell just divides to just produce four with the non-identical type of the haploid daughter cells. In meiosis is just used to get the type of the produced type of gametes and is are a necessary kind of precursor to the sexual reproduction.
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During subduction oceanic crust is pushed down toward the mantle and _____.
When dissolved carbon dioxide (CO2) combines with ocean water it forms a(n)
Answer:
Carbon dioxide (CO2) dissolves in the ocean and reacts with water to form carbonic acid—which in turn generates bicarbonate, carbonate, and hydrogen ions. Calcium and carbonate ions combine to form the solid calcium carbonate crystals in their shells and skeletons.
Explanation:
Item 7
How do chloroplasts support cellular functions?
A) They provide structure to the cell.
B) They synthesize, sort, and package proteins.
C) They convert glucose into usable energy.
D) They convert energy from the sun into glucose.
Answer:
D) They convert energy from the sun into glucose.
Explanation:
and that question i posted because i wanted to see what people thought about it, and to answer my question
Answer:
They convert energy from the sun into glucose
Explanation:
I took the quiz
why is mechanical digestion of food important?? please help I only need one reason marking brainliest btw
Answer:
it makes the food smaller
Explanation:
Mechanical digestion is a purely physical process that does not change the chemical nature of the food. Instead, it makes the food smaller to increase both surface area and mobility. It includes mastication, or chewing, as well as tongue movements that help break food into smaller bits and mix food with saliva.
This process involves DNA replication, which duplicates chromosomes
Mitosis
Meiosis
Both Mitosis & Meiosis
Answer:
Meiosis
Explanation:
Meiosis is the spliting of sex cells or chromosomes through the PMAT phase twice. Mitosis is the splitting of body cells such as skin cells ect. and only goes through PMAT once.
ANSWER FOR BRAINLIEST!!!
how long does it take new species to form on earth?
Research found that a major change to persist and for changes to accumulate took about one million years
Million of years...
tehy where evolving for a couple million years until we have the animals we have now
Where on the planet would you receive more direct sunlight?
A) locations in the mid-latitudes
B) at the North Pole
C) at the South Pole
D) places near the Equator
Answer:
D. places near the equator
how may earths would fit inside the sun?
Answer:
1.3 million Earths
Explanation:
Cryptosporidium parvum (C. parvum) is a single-celled, eukaryotic parasite that infects human cells in the digestive system and causes illness.
a. True
b. False
The statement 'C. parvum is a single-celled, eukaryotic parasite that infects human cells in the digestive system and causes illness' is TRUE. This parasite causes diarrhea.
Cryptosporidium parvum (C. parvum) is a single-cell protozoan that may cause severe self-limited diarrhea in immunocompetent individuals.
Cryptosporidium parvum develops its complete life cycle in the human intestines (also it can be found in animal intestines).
This species (Cryptosporidium parvum) is one of the six (6) known species of Cryptosporidium.
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reproduction in prokaryotes occurs primarily through the process known as
Reproduction in prokaryotes occurs primarily through the process known as Binary Fission.
Which of the following is NOT a cause for siblings to look differently?
sexual reproduction
independent assortment
crossing over
mutations
Answer:
mutations is the answer
Which organelle uses chemicals to break down food and worn out cell parts; Trash/cleaning Crew?
A.Endoplasmic Reticulum
B. Ribosome
C. Lysosome
D. Chloroplast
which structure has the function of transferring the egg from the ovary to the uterus?
Which Organelle assembles amino acids to create proteins?
A. Ribosome
B. Lysosome
C. Chrolorplast
D. Cell membrane
The answer should be A - Ribosome because during protein synthesis, ribosomes assemble amino acids into proteins and ribosome’s are the cellular structures responsible for protein synthesis.
hope this helps!
Ribosomes assembles amino acids to create proteins. The correct option A.
Ribosomes are the organelles responsible for assembling amino acids to create proteins in cells. Ribosomes are composed of RNA and proteins, and they exist either freely in the cytoplasm or attached to the endoplasmic reticulum (ER).
During protein synthesis, the ribosomes read the genetic information encoded in mRNA (messenger RNA) and facilitate the process of translation. Transfer RNA (tRNA) molecules transport amino acids to the ribosomes, where they are joined together in the correct sequence to form a protein chain.
Thus, the ideal selection is option A.
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What's the only kind of parrot that can't fly?
What is the proper definition for abiotic?
Answer:
In biology and ecology, abiotic components or abiotic factors are non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems
Explanation:
a nonliving condition or thing, as climate or habitat, that influences or affects an ecosystem and the organisms in it: Abiotic factors can determine which species of organisms will survive in a given environment.
hope this helps you.
how will you select and grow a resistant strain of e. coli in this experiment?
Streptomycin treatment is used in medicine. It s growth is to expose a sample of E.coli to streptomycin by innoculating it into a streptomycin positive plate. any colonies that grow will carry a mutation for resistance.
Streptomycin treatment is known to boast or increase the growth of E. coli by nitrate respiration.Streptomycin is simply regarded as an antibiotic which is often used to treat moderate to severe tuberculosis, pneumonia, E. coli, etc.
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How will you select and grow a resistant strain of E.coli in this experiment?multiple choice:
(1). expose a sample of E.coli to streptomycin by innoculating it into a streptomycin positive plate. any colonies that grow will carry a mutation for resistance,
(2.) expose a sample of E.coli to sterptomycin by innoculating it into a streptomycin negative plate, any colonies that grow will carry a mutation for resistance,
(3.) samples of bacteria are taken from the culture and observed under a microscope for signs of susceptibility or resistance. those that are resistant are separated and plated.
(4.) a culture of E.coli will be mixed with streptomycin so that the antibiotic can alter the genetic composition of the bacteria
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By keeping food cold, the growth of microorganisms is:
Answer:
they are called growth because you are training them