How do Na+ ions enter a neuron when an action potential is initiated
a) a voltage-gated Na+ facilitated transporter
b) a voltage-gated Na+ channel
c) the Na+/K+aATPase
d) a gated Na+ pump
e) the ligand-gated Na+ channel
Ans: b) a voltage-gated Na+ channel
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Penicillin stops bacterial cell wall formation by
A) inhibition of a transpeptidase. B) inhibiting synthesis of NAM. C) inhibiting synthesis of NAG. D) inhibiting transport of NAG and NAM past the permeable membrane.
Which individual may be a carrier for a recessive X-linked trait in humans?
a. a homozygous recessive male b. a homozygous recessive female c. a homozygous dominant female d. a heterozygous female e. a heterozygous male
What percent of analytes in plant samples identified from mass spectrometry are classified as
“unknown”?
a. 6% d. 60% b. 16% e. 96% c. 46%
Culturing of intracellular parasites generally requires (enrichment/cell culture/low oxygen) conditions
What will be an ideal response?