Unlike all other amine derived hormones, thyroid hormones
A. bind to membrane receptors to elicit a response.
B. activate second messengers via binding to a membrane receptor.
C. are derived from cholesterol.
D. are produced by the gonads.
E. bind to intracellular receptors rather than to membrane-bound receptors to elicit a response.
E. bind to intracellular receptors rather than to membrane-bound receptors to elicit a response.
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RNAi
A. is the form of mRNA that initiates translation. B. uses short pieces of single-stranded RNA to direct the degradation of specific RNA transcripts. C. is a mechanism of genetic regulation found in eukaryotes. D. is any chemical that inhibits transcription. E. uses short pieces of single-stranded RNA to direct the degradation of specific RNA transcripts AND is a mechanism of genetic regulation found in eukaryotes.
A rod-shaped bacterium is referred to as a ________
a. coccus b. spirillum c. pili d. bacillus
Which of the following organs of the digestive system is different from the other four because it does
NOT produce any secretions that aid in the digestive process? a. stomach b. liver c. esophagus d. pancreas e. salivary gland
All of the following characteristics apply to the organism in Figure 21-2 EXCEPT?
a. marine reptile b. lived during the Triassic period c. body form resembled a porpoise d. large eyes e. enlarged sharp claws