Proofreading by ____ corrects errors that occur during DNA replication
a. DNA polymerase
b. primase
c. telomerase
d. DNA ligase
e. helicase
ANSWER: a
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The structure in the above figure demonstrates which of the following?
a. transcription and translation occur simultaneously on a single strand b. ribosomes attached to a strand of DNA c. a small ribosomal subunit d. multiple ribosomes on a strand of mRNA e. a single unattached ribosome
The characteristic that enables efficient gas exchange in capillaries is:
a. the very short total length of the capillaries. b. their proximity to the heart. c. thick walls of connective and muscle tissue. d. walls that are only one cell thick. e. vasoconstriction.
________ are tiny blood vessels leading away from capillaries to veins.
Fill in the blank(s) with the appropriate word(s).
Muscle contraction is triggered
A. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites. B. by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide. C. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites. D. when high levels of oxygen and sugar are released by the sarcolemma. E. when a surplus of ATP is released by a nerve motor unit.