Give an explanation for the fact that athletes’ resting heart rates are usually slower than the average rate for healthy humans.
What will be an ideal response?
The heart muscle is stronger and as a result more blood can be pumped out of the heart with each contraction. Over time, exercise leads to more efficient respiratory and circulatory function.
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A protein that has been transported past the outer chloroplast membrane would have to pass how many more membranes to reach the stroma and thylakoid lumen, respectively?
A. 0,1 B. 1,2 C. 2,3 D. 3,4 Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about chloroplasts and membranes? What other information is related to the question? Choose Answer Do you have all necessary information to determine what was produced during the plant experiment? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Narrow-sense heritability for a trait can be obtained from a regression of midparent value on offspring value
Indicate whether the statement is true or false
Thymine is used in DNA despite the fact that it is energetically more expensive to synthesize than uracil because
A) spontaneous deamination reactions convert cytosine to uracil at a fairly high rate. B) uracil is more sensitive to ultraviolet (UV) damage. C) uracil is more susceptible to depurination. D) uracil can only bind with ribose, not deoxyribose. E) thymine is less likely to undergo spontaneous deamination than uracil.
The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following?
A) nuclei and chloroplasts B) mitochondria and chloroplasts C) cilia and mitochondria D) mitochondria and nuclei E) mitochondria and cilia