The ovules in a flower are located within a(n)
a. anther.
b. ovary.
c. stamen.
d. style.
B
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Which of the following is not a function of the signal recognition particle (SRP)?
A. halts translation B. binds to the ribosome C. binds to the channel in the rough endoplasmic reticulum D. targets certain proteins to be synthesized on the rough endoplasmic reticulum
An organism suspected of being one of the Vibrio spp. grew on MacConkey agar. To determine whether it was a vibrio cell or in the Enterobacteriaceae family, an oxidase test was performed on the colony. The results of the oxidase test, however, were negative. Which one of the follow-ing statements explains this discrepancy?
a. The oxidase test should be performed on TCBS agar, not MacConkey agar. b. The oxidase test should be performed on a sheep blood agar plate to avoid false-negative results. c. The pH of the MacConkey agar is most likely elevated to alkaline conditions. d. No discrepancy is present. All vibrio cells are oxidase-negative.
Sometimes an allele that has no phenotypic effect can spread through a population by means of
a. a selective sweep b. genetic recombination c. disruptive selection d. frequency-dependent selection e. directional selection
The evolution of similar forms in different lineages when exposed to the same selective pressures is
A. also known as natural selection. B. called divergence. C. referred to as descent. D. referred to as successive homologies. E. called convergence.