The most fundamental and important molecule that distinguishes living systems from nonliving matter is ____
a. protein
b. DNA
c. fructose
d. water
e. glucose
b
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The evolution of development of snout-length in cichlid fish is best explained by
A. a single gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
Which of the following is true of healthy G1 cells?
a) The p53 protein is found at very high levels. b) The probability of apoptosis in these cells is very high. c) The p53 protein is found at very low levels.
In a DNA molecule, base pairing occurs between
A) adenine and uracil. B) thymine and cytosine. C) guanine and uracil. D) adenine and thymine. E) adenine and guanine.
If, during a dissection, you were asked to place a pin in the part of the kidney containing the collecting duct, you would pin the
What will be an ideal response?