If we know how many thymine bases there are in a piece of DNA, we can calculate the number of the following bases:
a) Adenine
b) Cytosine
c) Guanine
d) Uracil
Answer:
in dna the T and A always go together so the answer is ademine
Which cell replicates via meiosis?(1 point)
sperm cell
heart cell
skin cell
red blood cell
thanks!!
Answer:
Sperm cell
Explanation:
Because it is a reproductive cell and in one of the stages of foetus growth is meiosis so this cell undergoes meiosis to pass that stage
Meiosis is the process by which cells divide into four haploid daughter cells.Sperms are the cells that replicates via meiosis. Option A is correct.
Meiosis:
It is the process by which cells divide into four haploid daughter cells.
The daughter cells contains half of its parents chromosomes.The daughter cells are genetically different from the parent cells.It is occur in the germ cells of the organisms to produce gametes like sperm and ovum.Therefore, sperms are the cells that replicates via meiosis.
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In cherry tomatoes, red color (R) is dominant to yellow color (r). If two heterozygous plants are crossed, what percentage of the offspring will be yellow?
Answer:
50
Explanation:
If you cross two heterozygous tomato plants, you get four base genotypes of (Respectively,) RR, Rr, Rr, and rr. That makes your percentage A. 50%.
Explain h0mozygous and heter0zygous?If a dominant red fruit (RR) plant is crossed with a recessive over yellow fruit (rr), then the phenotype will be red fruit and the genotype Rr. It is a case of complete dominance.
In diploid organisms (2n), an individual is homo-zygous when it carries two copies of the same gene variant (i.e., the same allele).
Moreover, an individual is heter0zygous when it carries two different alleles for the same gene locus.
In complete dominance, the dominant allele completely masks the expression of the recessive allele in heter0zygous individuals.
Thus, That makes your percentage A. 50%.
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Evolution is a useful theory because it helps us:
(A) make predictions
(B) survive and reproduce
(C) establish the genetic code
(D) form questions
Answer: C
Explanation:
Which best describes tA male cardinal's red color is an example of a trait affected by natural selection. The females of the species choose mates based on the vibrant colors of the males' feathers. If females begin using different criteria than feather color when they choose mates, what would most likely happen to the color of the male cardinals over time? he fossil record?
Question:
A male cardinal's red color is an example of a trait affected by natural selection. The females of the species choose mates based on the vibrant colors of the males' feathers. If females begin using different criteria than feather color when they choose mates, what would most likely happen to the color of the male cardinals over time?
Answer:
Feather color loses importance in sexual selection and becomes disadvantageous for males. There is a decrease in red color variation among males.
Explanation:
In cardinal species, females choose males to mate according to their vibrant red color. The redder the male is, the better genetic charge it has, and the better choice for mating it becomes.
Red feather color is a trait that reflects the genetic quality of males. So individuals with the most vibrant red color express better capabilities of finding food, competing for resources, competing for males, among others, are the best option to mate and to ensure successful offspring.
The brightest or most vibrant males are in red, the better chances they have to mate and pass their genes to the following generations. So the organism spends energy and resources to produce more vibrant colors to enhance mating chances.
However, if females begin using different criteria than feather color when they choose mates, color production stops making sense. What is even more, it becomes more disadvantageous for males because females do not use color for their choices, males spend energy when producing it, and the redder the males are, the more chances to be predated they have. So basically, males´ feather color loses importance. The selection pressure in males turns to the evolution of another trait. The shade variation of red feathers will decrease over time.
in prokaryotes certain proteins act to regulate genes by binding dna, what could be the effect of these binding proteins?
Answer:
This question lacks options, the options are:
A. They may act to turn on gene transcription.
B. They may act to turn off gene transcription.
C. They may become added to DNA, and then be transcribed.
D. They may remove a gene from DNA.
E. They may alter the nucleotide sequence in a gene.
Options A and B are the answers.
Explanation:
Prokaryotes regulate gene expression at the transcriptional level. Gene expression is the process whereby living organisms synthesize useful products such as protein from a gene. Prokaryotes such as bacteria control the expression of their genes via proteins that bind to DNA called REGULATORY PROTEINS.
These regulatory proteins also known as TRANSCRIPTION FACTORS, act to regulate genes by binding DNA. The binding of DNA either prevents or promote the binding of RNA polymerase in order for transcription to occur.
- Regulatory proteins which may act to inhibit transcription of DNA by turning off gene are called REPRESSORS.
- Regulatory proteins which may act to promote transcription of DNA by turning on gene are called ACTIVATORS.
Which action has the most harmful impact on the environment?
A. Reusing a steel water bottle at a water fountain
B. Buying a new plastic water bottle and throwing it away
C. Drinking directly from a water fountain or from a sink
D. Using a disposable paper cup to get water from your sink
Buying a new plastic water bottle and throwing it away has the most harmful impact on the environment. Thus, the correct option is B.
What is BPA?Hard plastics, such drinking water bottles and numerous home objects, contain the chemical BPA. According to research, BPA exposure can cause the endocrine system to malfunction. However, the average person's daily exposure levels are unlikely to cause substantial harm.
Using non-BPA-free water bottles and failing to properly dispose of them in a trash can would be the activity that would have the most detrimental effects on the environment.
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Describe the impact of human activities on natural resources;
consider energy, mineral, forest, marine, over population and over fishing.
Answer:
As the human population has grown, the need for more land has caused an increase in the cutting down of forest lands for habitation and farming. The result has been an increase in soil erosion, an increase in species extinction from habitat loss, and a reduction of oxygen supplied by the trees, as well as lower amounts of carbon dioxide being removed from the atmosphere. Industrial and personal use of fossil fuels has dramatically increased the amount of air pollution in the atmosphere while systematically using up the supply of the non-renewable resources such as coal, oil and natural gas
Explanation: Hope this helps! ^^
Explanation:
With over 600 muscles in the body we are able to do an array of motions. What is the difference between what big muscles, like the four in the quadriceps, can do and what those like the thirty in our hands can do?
The functions of each muscle depend on its location and ability to perform specific work. For example, the masseter muscle is the strongest muscle in humans which is present in the jaw.
What is the significance of muscles?The significance of muscle is understood by the fact that these structures are linked to bones, internal organs, and blood vessels. These components are responsible for movement by their contractions.
According to the context of this question, the muscles in the shoulder region are the four rotator cuffs which significantly include the supraspinatus, infraspinatus, teres minor, and subscapularis. The four muscles in the quadriceps have to perform a different function which includes heavy weightlifting, so, they have to strongest enough.
While the thirty muscles present in the hand can do numerous functions with different levels of intensity. These muscles are not too strong as compared to masseter but are superior.
Therefore, the functions of each muscle depend on its location and ability to perform specific work.
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GIVING BRAINLIEST!!!
There has been an increase in the number of foxes in the area. What type of environmental change is this for rabbits?
A) Pollution
B) Climate change
C) Reduced space
D) Increased predators
Answer:
D increased predators
Explanation:
Foxes are predators of rabbits, Which means the rabbits will be indangerd
Dan Perkins was a policeman who was able to run a short distance in a very short time in order to escape the danger of a fire. What molecule allowed him to have a burst of instant energy to make that sprint?
!PLEASE HELP ASAP! what is the half-life of the radioactive isotope? what mass of the radioactive isotope will be left after three(3) half-lives?
Behavior is produced in living things through the combination of which 2 major influences
Answer:
abilities, gender, race and culture etc
If an organism suddenly appeared after being extinct what is going on?
Answer: The organism probably evolved to become the same animal again, or the animal was never actually extinct
Explanation:
Answer: it probably found another habitat to live in with less human interaction, more access to food and water. With a higher chance of survival rate.
Explanation:
The cells produced by the lymph nodes are ____.
A. White blood cells
B. Red blood cells
C. Osteoblasts
D. Osteocytes
Answer:
A. white blood cells
Explanation:
those links are by bots i think
Someone answerr these plssss
An organism is living in a rapidly changing environment. Sexual reproduction is
advantageous to an organism in this situation because- *
Answer:
I'm pretty sure it's A
Explanation:
................
Since its inception, the theory of evolution has been the subject of frequent debate. Those who oppose evolutionary theory often point to gaps in the fossil record in an attempt to discredit the theory. Which statement would be the best counter argument as to why the fossil record can be relied upon to support evolution?
A. The fossil record provides evidence that extinct species only fossilized during certain geological eras.
B. The fossil record provides evidence that extinct species are genetically identical to current species.
C. The fossil record provides evidence of many different types of organisms, since most species fossilize well.
D. The fossil record provides evidence of many transitional organisms that show relationships between species.
Answer:
D. The fossil record provides evidence of many transitional organisms that show relationships between species.
Explanation:
Evolution is the process of changes in characteristics of an organism as time passes. In order for fossil records to support this, there must be some linkage between species to species. Therefore the correct answer is D. The fossil record provides evidence of many transitional organisms that show relationships between species..
Since its inception, the theory of evolution has been the subject of frequent debate, and the fossil record can be relied upon, the fossil record provides evidence of many transitional organisms that show relationships between species, which is in Option D.
What is the significance of the fossil record?The fossil record tells about the ancestors and explains the diversity of life on Earth over thousands or millions of years ago. It is commonly found in sedimentary rock formations and provides information about how organisms lived thousands or millions of years ago.
Hence, since its inception, the theory of evolution has been the subject of frequent debate, and the fossil record can be relied upon, the fossil record provides evidence of many transitional organisms that show relationships between species, which is in Option D.
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Pablo and Johanna have to do a yearlong study for their biology course. After some discussion, they decide to try comparing their dogs and the diet that they feed them. Each has a dog from the pound, and both dogs are less than one year old. Pablo feeds his shepherd-mix dog a special diet of wet and dry foods from the local vet, while Johanna uses generic dry kibble from the supermarket for her bulldog. They want to see which diet results in bigger, healthier, faster-growing dogs. The reason the instructor gives them will include the fact that they have too many ______
Answer:
The correct answer is - variables that they didn't control and not enough replicates
Explanation:
In this particular case, Pablo and Johanna using too many variables in their experiment or research, All the variables used, are not controlled and with time these variables can not be replicated again on experiment groups.
They did not select a particular age or weight of dogs, the diets are different and they feed dry kibble to only one dog. There are so many variables and for a better result experiment, all variables should be controlled only the independent variable is permitted to manipulate.
Radiation is a method of thermal energy transfer that moves-
Helppplp plss I’ll choose as brainliest
Answer:
-heat
Explanation:
Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up.
Good luck!!
Answer:
Explanation:
Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation. This is a type electromagnetic radiation .
vinosum is most closely related to which organism
Answer:
Radiodurans, thermophilius
Explanation:
A Vinosum is most closely associated with the thermophilus and the Radiodurans.
What do you mean by Vinosum?Vinosum may be defined as a gram-negative bacteria which is rod-shaped in structure, anoxygenic in nature, and categorized under purple-sulphur bacteria.
Vinosum bacteria are thermophilus which means they survive at relatively high temperatures. They are halotolerant which means they survive in extremely high salt concentrations.
Therefore, a Vinosum is most closely related to the thermophilus and the Radiodurans.
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Which describes the relationship between human beings and the Earth system?
A. Human actions affect the Earth system only minimally and temporarily.
B. Human actions are influenced by the Earth system but do not affect it.
C. Humans are a part of the Earth system, and their actions affect its parts.
D. Humans are independent of the Earth system.
Therefore, the correct option here is option "c"
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PLS HELP! A single celled organism that lives in extremely hot or acidic environment with no membrane-bound organelles most likely belongs to
1. archaea, bacteria, and eukarya
2. archaea and bacteria
3. archaea only
4. bacteria only
Answer:
i thinks its 4 but i am not that positive
A single celled organism that lives in extremely hot or acidic environment with no membrane-bound organelles most likely belongs to archaea, bacteria, and eukarya. Thus, the correct option is 1.
What are Single-celled organisms?A unicellular organism is also known as a single-celled organism. It is an organism which consists of a single cell, unlike a multicellular organism that consists of multiple eukaryotic cells. Organisms fall into two major categories including prokaryotic organisms and eukaryotic organisms.
All of the life forms can be divided into three major domains, based on the type of cells of the organism into
a. Bacteria: These cells do not contain a nucleus.
b. Archaea: These organisms do not contain a nucleus, however they have a different cell wall from bacteria.
c. Eukarya: These cells contain a well-defined nucleus
Therefore, the correct option is 1.
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B. The wave's amplitude is equal to half of this height. What is the
amplitude?
When the wave's amplitude is equal to half of this height (H), the wave's amplitude is 0.5 H.
What is amplitude of waves?The amplitude of waves is the maximum height attained by the wave. The amplitude of a wave is the maximum vertical displacement of the wave.
When the wave's amplitude is equal to half of this height, the amplitude is calculated as follows;
Let the height = H
Amplitude = 0.5 H
Thus, when the wave's amplitude is equal to half of this height (H), the wave's amplitude is 0.5 H.
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What is the ratio of the parental cross between Gg x gg
Answer:
Answer in explanation below!
Explanation:
I used a punnett square to figure this out!
phenotypic ratio ( meaning how it will look ) = 1 : 1 ( Gg = 50% & gg = 50% )
genotypic ratio ( the allele combo ) = 1 : 1 ( Gg = 50% & gg = 50% )
I hope this helps, good luck!
Geologists were examining an area in Africa called the Great Rift Valley. Which geologic event MOST likely caused the formation of the valley?
O A impacts from meteors
O B. collision of tectonic plates
O c. diverging continental plates
O D. movement of glaciers
Answer:
c. diverging continental plates
Explanation:
What two chromosomes do males have for gender?
A.Sperm cells do not contain sex chromosomes.
B.X and Y chromosomes
C.X chromosomes
D.Y chromosomes
Answer:
option b X and Y chromosomes is the answer for this question
NEED ASAP BIOLOGY 50 POINTS
Answer:
1. carbohydrates
2.nucleic acid
3.proteins
4.lipids
5.nucleic acid
6.proteins
7.lipids
8.carbohydrates
Explanation:
Which of the following describes an effect of particulate matter on health?
Fine particles are less dangerous, as they mainly affect nasal passages.
Coarse particles are associated with aggravated asthma.
Coarse particles are more dangerous, as they infiltrate deep into the lungs.
Fine particles are associated with decreased lung function.
Answer:Particle pollution and health risks, including premature death. Health effects may include cardiovascular effects such as cardiac arrhythmia´s and heart attacks, and respiratory effects such as asthma attacks and bronchitis.
Explanation:
Why do organisms that fertilise internally tend to produce less eggs?
Answer:
Explanation: Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. The embryo is isolated within the female, which limits predation on the young. ... Even though fewer offspring are produced through this method, their survival rate is higher than that for external fertilization.
Where do the reactants come from in cellular respiration?
Answer:
Oxygen and glucose are both reactants of cellular respiration. Oxygen enters the body when an organism breathes. Glucose enters the body when an organism eats.
Explanation: