BIOLOGY HIGH SCHOOL

Which function of the muscular system is best illustrated by the heart pumping blood throughout the body?

Answers

Answer 1
Answer: Contraction and relaxation of the heart is the function of the muscular system whereby illustrated by the pumping of the blood by the heart throughout the body. Though everyone is not aware, the constant contraction and relaxation of the muscles help fight gravity, that is why the muscular system is a great help in maintaining good posture.
Answer 2
Answer:

Answer:

Contraction and relaxation of the heart is the function of the muscular system whereby illustrated by the pumping of the blood by the heart throughout the body. Though everyone is not aware, the constant contraction and relaxation of the muscles help fight gravity, that is why the muscular system is a great help in maintaining good posture.

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Cells exchange material across the cell ___?

Answers

Cells exchange material across the cell membrane.

Regulation of gene expression using siRNAs is found in: a. prokaryotes only b. eukaryotes only c. prokaryotes and eukaryotes

Answers

Regulation of gene expression using siRNAs is found in eukaryotes only. 

If a mutation introduces a new skin color in a lizard population, which factor might determine whether the frequency of the new allele will increase? A)how many other alleles are present
B)whether the mutation makes some lizards more fit for their environment than other lizards
C)how many phenotypes the population has
D)whether the mutation was caused by nature or by human intervention

Answers

The answer is B) whether the mutation makes some lizards more fit for their environment than other lizards.

If a mutation introduces a new skin color in a lizard population and that mutation makes some lizards more fit for their environment than other lizards then the frequency of the new allele will increase. For example, if a mutation causes some dark skin color which can help some lizards to survive. The more lizards with dark skin color will survive, and after some time, the frequency of the new allele will increase.

Answer:

1. on end of figure 17-1 shows an increase in average beak size for a population of birds.

Directional stabilization

2. Figure 17-2 shows highest fitness toward the center of the curve.

Stabilizing selection.

3. Figure 17-3 shows smaller and larger beaks in a population of finches.

disruptive selection

4. If a mutation frequency introduces a new skin color in a lizard population, what factors might determine whether the frequency of the new allele will increase

whether the mutation makes some lizards more fit for their environment that other lizards.

5. genetic drift, the alleles frequencies in a gene pool change because of

Chance.

Explanation:

I got 100 % on my quiz, because of these answers.

Smooth muscles are found in all of the internal organs except what?

Answers

All the organs except for the heart which is cardiac muscle.

If you cry a lot, would you eventually go blind?

Answers

Answer:

No, you would not go blind, even though the composition of emotional tears are different.

Answer:

Simply no, But when humans cry in response to stress, their tears contain a number of stress hormones and other chemicals. Researchers believe that crying could reduce the levels of these chemicals in the body, which could, in turn, reduce stress.

Which of the following statement is true of a semi-conservative model of replication?1) Each newly synthesized double helix of DNA contains one new strand and one old strand.

2)DNA synthesis involves conserving only part of each of the original strands in a DNA molecule.

3)The original DNA molecule is stored in the cell nucleus and serves as a template for creating copies containing two new strands.

4)DNA synthesis involves conserving one strand of a double helix of DNA and discarding the other.

Answers

Answer - A
Semi-conservative model of replication involves the replication of DNA in all the familiar cells in such a way that each newly synthesized daughter cell contains a double helix with one new strand and one old strand.

The statement that is true of a semi-conservative model of replication is "each newly synthesized double helix of DNA contains one new strand and one old strand. The correct statement is A. 
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