After the depolarization phase of an action potential, the resting potential is restored by _____
A) the opening of sodium activation gates
B) the opening of voltage-gated potassium channels and the closing of sodium channels
C) a decrease in the membrane's permeability to potassium and chloride ions
D) a brief inhibition of the sodium-potassium pump
E) the opening of more voltage-gated sodium channels
Answer: B
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Which of the following occurs when the cAMP-CAP complex binds the CAP site near the lac promoter?
A. Transcription rate decreases. B. Transcription rate increases. C. RNA polymerase binds to the promoter. D. RNA polymerase binds to the promoter and transcription rate decreases. E. RNA polymerase binds to the promoter and transcription rate increases.
Which of the following enables almost all cells of the body to be recognized by an individual's immune system as "self"?
A. The presence of class I MHC molecules on cell surfaces B. The presence of class II MHC molecules on cell surfaces C. The presence of ABO antigenic markers on cell surfaces D. The presence of Ig D molecules on cell surfaces
What other cells should you examine for effects from this mutant gene?
A. prefrontal neurons B. gustatory neurons C. cholinergic neurons D. Schwann cells Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content/Choose Answer · What do you already know about this mutation? Which cell type do we know it affects? Consider Alternatives · What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Sulfur has an atomic number of 16. How many covalent bonds can sulfur form?
A) 1
B) 2
C) 4
D) 0