Drugs, such as cocaine and nicotine, mimic the action of neurotransmitters
a. True
b. False
Indicate whether the statement is true or false
True
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In vertebrate animals, spermatogenesis and oogenesis differ in that _____
A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development B) oogenesis produces four functional haploid cells, whereas spermatogenesis produces only one functional spermatozoon C) cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis D) oogenesis ends at menopause, whereas spermatogenesis is finished before birth E) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born
Which of the following are characteristics that all bryophytes share? Select all correct choices
A. thalli B. sporophyte and gametophyte generations C. stomata D. water-dependent sperm E. desiccation resistance
If an organism has 12 chromosomes in its gametes, how many chromosomes would be found in a fertilized cell made by this organism?
a. 12 b. 18 c. 24 d. 36
What enzyme is required to convert carbon dioxide into carbonic acid?
a. carboxyl isomerase b. carbonic dehydrogenase c. carbonic anhydrase d. carboxyl fumarase