What stimulates spermatogenesis?
A. Progesterone
B. Testosterone
C. Estradiol
D. LH
E. FSH
Answer: E
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Which one of the following statements about DNA is incorrect?
A. DNA typically exists in cells as a double helix. B. There are 10 base pairs per turn in a helical DNA molecule. C. DNA has a diameter of approximately 2 nanometers. D. The strands in DNA wrap around each other in a helix that coils to the right. E. All of the statements about DNA are correct.
Which of the following statements about the concept of an ecological footprint is false?
A. Countries with the largest population sizes have the largest ecological footprints. B. It is an estimate of how much land is required to provide the resources used by an individual. C. The total ecological footprint for humanity is greater than the actual surface area of Earth. D. It encompasses the energy used to produce goods AND the energy used to ship those goods to a store. E. Undeveloped countries have smaller ecological footprints than developed countries.
Four of the five answers listed below are steps in translation. Select the exception
a. initiation b. replication c. chain elongation d. termination e. anticodon
Cephalosporins and penicillins act on the cross-linkages in peptidoglycan. This usually results in
A) membrane breakdown. B) cell lysis. C) gram-positive cells becoming gram-negative. D) inhibition of protein synthesis.