A teenager shows up at a clinic with lesions on his face. The sores are raised, light-colored bumps with a waxy texture. A few similar lesions are present on the torso as well. With which of the following viruses might he be infected?
A) human herpesvirus 1
B) B19 virus
C) human herpesvirus 4
D) molluscum contagiosum
E) papillomavirus
D
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The reaction: pyruvate + CoA + NAD+ ? acetyl CoA + CO2 + NADH, is catalyzed by pyruvate dehydrogenase. If an inhibitor of this enzyme was added to cells, then ___ levels in the cytoplasm would increase.
A. NADH B. Pyruvate C. Acetyl CoA D. CO2
Calcium ions regulate contraction of smooth muscle cells by binding to _____
A) troponin B) tropomyosin C) actin D) myosin E) calmodulin
Chlorophyll b absorbs green wavelengths of light that chlorophyll a cannot absorb. In this respect, chlorophyll b acts as
A. an accessory pigment. B. an energizer for photosynthetic bacteria. C. a light absorber in the green light. D. a more efficient pigment.
The cells that carry signals to muscles and glands are the
a. sensory neurons. b. neuroglia. c. dendrites only. d. motor neurons. e. axons only.