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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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 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
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.