Binding of the appropriate aminoacyl-tRNA to the A site requires:a
no additional energy.
b. the input of two ATP molecules to supply the needed energy.
c. energy supplied by GTP.
d. activation of the A site.
e. phosphorylation of the tRNA molecule.
C
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Although the expression of most genes is tightly regulated, some genes are expressed at roughly constant rates. Which of the following genes would you predict to be constitutively (constantly) expressed?
A) genes involved in the biosynthesis of the amino acid tryptophan B) genes involved in the degradation of tryptophan C) genes involved in the degradation of arabinose, a sugar D) genes that code for regulatory proteins
Cladograms include in the phylogenetic tree shared primitive characters and shared derived characters. The derived characters can also be called ______ why the primitive characters can also be called ___________.
A. character states; symplesiomorphy B. symplesiomorphy; ingroup C. outgroup; synapomorphy D. synapomorphy; outgroup E. synapomorphy; symplesiomorphy
Otto Loewi demonstrated that neurons transmit signals across synapses
a. by electrical signals. b. by Vagusstoff. c. by acetylcholine. d. by chemical signals. e. by proteins
The replisome has two main subcomponents. They are
A. the replication folk and the DNA pol III enzymes. B. the primosome and the DNA pol III enzymes. C. the DNA pol III enzymes and the sliding clamp subunits. D. the primosome and the sliding clamp subunit. E. the replication folk and the sliding clamp subunit.