A promoter at the beginning of a genetic operon is a(n)
A. enzyme that facilitates the transcription of DNA
B. site where DNA replication begins
C. site on DNA where RNA polymerase binds
D. site on RNA where translation starts
E. gene that codes for RNA polymerase
Answer: C. site on DNA where RNA polymerase binds
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What will be an ideal response?
A G protein:
A. is a component of a signal-transduction pathway that is coupled to a G proteincoupled receptor. B. is composed of three subunits and is inactive when bound to GDP. C. releases GDP and binds to GTP when associated with an activated receptor. D. becomes deactivated when bound GTP is dephosphorylated to GDP. E. All of these choices are correct.
In translation the joining of amino acids is catalyzed by the enzyme ____
a. RNA polymerase b. reverse transcriptase c. peptidyl transferase d. polyadenylase e. aminoacyl-tRNA synthetase
Which of the following is not a flatworm?
a. tape worm b. ringworm c. blood fluke d. planaria e. Bipalium