The electron transport system
A. requires a membrane.
B. utilizes the nuclear membrane of eukaryotes.
C. utilizes the mitochondrial membrane of prokaryotes.
D. generates a concentration gradient of protons.
E. requires a membrane AND generates a concentration gradient of protons.
E
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What would happen if a mutation created a new allele that decreased fitness?
A) The new allele would spread through the population and decrease the fitness of that population. B) The new allele would decrease the fitness of the individual that possessed it, and that individual would have few or no offspring. C) The new allele would have to change back to an allele of higher fitness so the possessor of that allele could maintain its fitness. D) The individual with the new allele would wait for an environmental change so that its fitness would increase again.
In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously
Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signaling? A) Growth factor ligands do not bind as efficiently to receptors. B) Hormone concentrations decrease. C) cAMP levels change very frequently. D) Enzymatic activity declines.
A friend has been asked to be a bone marrow donor for her sister. She tells you that her sister has low red blood cell counts that drop more every day. Your friend doesn't understand why blood transfusion wouldn't work without having to do a bone marrow
treatment. How would you explain the need for the bone marrow donation to your friend? What will be an ideal response?
The type of change in chromosomal structure in which a chromosome segment is repeated in the same chromosome is called a(n) _______.
a. inversion b. translocation c. deletion d. duplication