The search for a(n) ____ treatment led to the discovery that DNA carries genetic information
a. pneumonia
b. AIDS
c. tuberculosis
d. influenza
e. SARS
a
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In an enzyme-catalyzed reaction, the reactant is called the
A. coenzyme B. catalyst C. substrate D. product
Some members of the Domain Bacteria have
a. a nucleus. b. membrane-bound organelles. c. chloroplasts. d. photosynthetic ability.
In the 1920s, Otto Loewi discovered that
a. a frog heart would beat outside the animal. b. the nerve to a frog’s heart released a chemical that affected only that heart. c. neuron endings release a neurotransmitter when stimulated. d. a saline solution caused an isolated frog heart deprived of its own nerve supply to beat more slowly. e. ACh acts on skeletal muscle, smooth muscle, the heart, some glands, and the brain.
Small, nonpolar molecules easily pass through the phospholipid bilayer because the molecules:
A) can dissolve in the hydrophobic portion of the bilayer. B) dissolve in water and follow the water as it flows into the cell. C) are brought in by attaching to cholesterol in the membrane. D) are brought in by attaching to structural proteins in the membrane.