The depolarization phase of an action potential requires _____
A) opening of K+ channels in the membrane
B) opening of Na+ channels in the membrane
C) opening of Ca2+ channels in the membrane
D) a K+ concentration gradient across the membrane
E) a Ca2+ concentration gradient across the membrane
Answer: B
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Which cyclin protein is present throughout the majority of the cell cycle?
1) D 2) E 3) A 4) B
How many oxidation reactions occur during the Krebs cycle?
A. 1 B. 2 C. 4 D. 6 E. 9
All of the following structures of the ear pass
on vibrations from sounds except the
a. hammer b. eardrum c. oval window d. organ of Corti e. cochlea