Synthetic anabolic steroids can mimic the effects of
a. cortisol.
b. thyroxin.
c. aldosterone.
d. testosterone.
e. epinephrine.
D; Anabolic steroids are analogs of the male hormone testosterone. Although they may not act exactly like testosterone, they produce many of its effects on secondary sex characteristics and can suppress the production of endogenous testosterone by the testes.
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Both plant and animal cells have all the following structures EXCEPT
a. a cell membrane. b. a nucleus. c. mitochondria. d. chloroplasts.
A mixture of DNA fragments is amplified from a sample of ocean water. Which gene(s) could be definitively categorized as originating from a species of animal?
A. Genes for ATP synthase B. Cell cycle regulatory genes C. Gene for Spongin D. Genes for biosynthesis of chitin E. Genes for RuBisCO
During which stages of bacterial growth is an infected patient most at risk of spreading the organism to others?
A. lag phase and exponential growth phase B. exponential growth phase and stationary growth phase C. stationary growth phase and death phase D. exponential growth phase, stationary growth phase, and death phase
With almost no exceptions, the nitrogen fixers are
A. green plants. B. insects. C. beans. D. mammals. E. prokaryotes.