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
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Arrange the structures that control cardiac output in the correct order
a. baroreceptors ? brain stem ? autonomic nervous system ? heart b. baroreceptors ? heart ? brain stem ? autonomic nervous system c. brain stem ? baroreceptors ? autonomic nervous system ? heart d. autonomic nervous system ? brain stem ? heart ? baroreceptors e. heart ? baroreceptors ? autonomic nervous system ? brain stem
The influenza virus can infect:a
humans b. pigs c. birds d. humans and pigs e. humans, pigs and birds
All of the following are granulocytes except ________.
A. lymphocytes B. neutrophils C. basophils D. eosinophils E. All of the choices are granulocytes.
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