In the human retina, _____
A) cone cells can detect color, but rod cells cannot
B) cone cells are more sensitive than rod cells to light
C) cone cells, but not rod cells, have a visual pigment
D) rod cells are most highly concentrated in the center of the retina
E) rod cells require higher illumination for stimulation than do cone cells
Answer: A
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Which one of the following is NOT a component of each monomer used to make proteins?
A) a phosphorus atom, P B) an amino functional group, NH2 C) a side chain, R D) a carboxyl group, COOH
At about pH 7 in most cells, what happens to the amino R-group on an amino acid?
A) It acts as a base and gains a proton, giving it a positive charge. B) It acts as an acid and loses a proton, giving it a negative charge. C) It is reduced, and tends to act as an electron donor in redox reactions. D) It remains neutral, like water, and does not have a charge.
In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment, which one of the following would you NOT expect to find in the collection flask?
A. urea B. amino acids C. ATP D. adenine E. formaldehyde
Long-day plants flower only when hours of darkness are ________
a. equal to hours of light b. decreasing c. less than a critical value for the species d. greater than a critical value for the species