According to the biological species concept, which of the following statements is not correct?
(A) To be considered a species, a population must be reproductively isolated from other species
(B) For a new species to arise, it must be geographically isolated from its parent species for long periods of time
(C) Organisms that are phenotypically identical yet have distinct mating behavior are considered distinct species since they do not naturally interbreed
(D) Organisms that can interbreed and produce sterile offspring are considered distinct species
Ans: (B) For a new species to arise, it must be geographically isolated from its parent species for long periods of time
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When does the phosphodiesterase that is required to deactivate cAMP exist in the cell?
a. It is synthesized in response to increasing cAMP concentrations. b. It is actively absorbed from the intercellular medium by the cell. c. Phosphodiesterase is always present in the cell. d. Phosphodiesterase is a byproduct of cAMP hydrolysis.
Which of the following is false regarding agerelated
macular degeneration? a. It results in progressive destruction of photoreceptors in the fovea and surrounding region. b. It clouds the center of the visual field. c. It has no genetic basis. d. Smoking, high blood pressure, and obesity increase its risk. e. It cannot be cured, but its progression can be slowed.
Which of the following is a member of the domain bacteria?
a. euglena b. methanogens c. halophiles d. cyanobacteria e. giardia
The most important function of sexual reproduction is
A) limiting genetic recombination. B) preserving genetic purity. C) creating genetic variability. D) producing offspring identical to the parents. E) keeping the genes from changing.