The ability to determine where a sound is coming from depends primarily on
A. differences in sound intensity in the two ears.
B. differences in time of sound arrival to the two ears.
C. differences in sound frequency received at the two ears.
D. differences in both frequency and intensity at the two ears.
E. None of these choices are correct.
B. differences in time of sound arrival to the two ears.
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Viruses are characterized by all of the following except
A. being found in every organism investigated so far. B. being specific to the hosts they infect. C. being capable of independent reproduction. D. being acellular.
Refer to the accompanying figure. Which structure is the source of sebum, a substance that inhibits bacterial growth on the surface of the skin?
a. 5
b. 7
c. 10
d. 11
e. 12.
Which of the following is false about the enzyme lysozyme?
A) can be found in mucus, saliva, tears, and breast milk B) destroys viruses and fungi C) acts as a chemical barrier D) kills bacterial cells E) breaks down bacterial cell walls
The high-energy electrons of photosystem I are directly passed on to ____
A), ferrodoxin. B), plastoquinone. C), plastocyanin. D), ATP synthase.