Which site on the ribosome is never occupied by a tRNA linked to a nascent polypeptide chain?
A. the A site
B. the P site
C. the E site
C
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In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total number of
shared electrons in CH4 is ____.
a. 1 b. 2 c. 4 d. 5 e. 8
Human cells produce perhaps as many as 100,000 different proteins, and yet the human genome has
only about 20,000 genes. This is best explained by
a. aminoacylation. b. exon shuffling. c. the wobble hypothesis. d. degeneracy. e. alternative splicing.
The sliding filament model explains ________
a. all of the choices b. only the participation of ATP in muscle contraction c. only how each sarcomere shortens during contraction d. only the opposite movements of myosin and actin
What is the tropism that describes the movement of a plant towards light?
A. negative gravitropism B. positive gravitropism C. positive phototropism D. negative phototropism E. thigmotropism