A toxin that binds specifically to voltage-gated sodium channels in axons would be expected to _____
A) prevent the hyperpolarization phase of the action potential
B) prevent the depolarization phase of the action potential
C) prevent graded potentials
D) increase the release of neurotransmitter molecules
E) have most of its effects on the dendritic region of a neuron
Answer: B
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A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. amniocentesis. B. genetic counseling. C. chorionic villi sampling. D. a pedigree analysis.
Depolarization of the neuronal plasma membrane occurs due to ____
a. the diffusion of K+ into the cell b. the diffusion of K+ out of the cell c. the diffusion of Na+ into the cell. d. the diffusion of Na+ out of the cell e. closed gated channels
If a ball begins to roll down an incline, its ________ energy is converted into ________ energy.
Fill in the blank(s) with the appropriate word(s).
A new arrow labeled "lengthens" could be added between __________.
a. "target DNA" ? "DNA strands" b. "primers" ? "DNA strands" c. "Taq polymerase" ? "primers" d. "target DNA" ? "primers"