Dependence on animal vectors for fertilization and

dispersal is characteristic of many species of
a. ferns.
b. angiosperms.
c. mosses.
d. conifers.
e. cycads.


Answer: b

Biology & Microbiology

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Arrange the structures that control cardiac output in the correct order

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Biology & Microbiology

The influenza virus can infect:a

humans b. pigs c. birds d. humans and pigs e. humans, pigs and birds

Biology & Microbiology

All of the following are granulocytes except ________.

A. lymphocytes B. neutrophils C. basophils D. eosinophils E. All of the choices are granulocytes.

Biology & Microbiology

E. coli can synthesize the amino acid threonine or absorb it from the environment. In the thr operon, the repressor is active when it is bound to threonine. If an E. coli bacterium is in an environment where threonine is absent, will transcription of

threonine synthesis genes take place? Why or why not? A) yes, because threonine will not be bound to the repressor, so the repressor will be inactive B) no, because threonine will not be bound to the repressor, so the repressor will be inactive C) yes, because threonine will not be bound to the repressor, so the repressor will be active D) no, because threonine will not be bound to the repressor, so the repressor will be active

Biology & Microbiology