Identify the stage of mitosis shown in panel B
a. interphase
b. prophase
c. metaphase
d. anaphase
e. telophase
ANSWER: d
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What is the general effect of humans on the nitrogen (N) and phosphorus (P) cycles?
A. We greatly increase levels of N and P through the burning of fossil fuels. B. We cause levels of N and P in the environment to drop through our farming practices. C. We overuse N and P in our farming practices and cause high levels to enter the natural environment. D. We deplete levels of N and P in our farming practices and do not replenish them.
Recombination between homologous chromosomes:
A. can lead to a gene conversion event if the region between the two Holliday intermediates contains base pair differences. B. uses extended synthesis-dependent strand annealing (ESDSA) rather than synthesis-dependent strand annealing (SDSA). C. can occur at completely random sites on the chromosome; there is no apparent regulation of the process. D. occurs between sister chromatids and nonsister chromatids with equal frequency. E. None of the choices given is true.
Which of the following is contained in the semen?
a. a substance that raises the pH in the female reproductive tract b. a substance that triggers contraction of muscles in the female reproductive tract c. a fast-acting enzyme that breaks down the semen clot d. a slow-acting clotting enzyme
Membranes of thermophilic bacteria are stabilized by phospholipids with ________.
A. fatty acids that tend to be more saturated B. fatty acids that have more double bonds C. fatty acids that have lower molecular weights D. All of the choices are correct.