Children have short eustachian tubes, and are susceptible to ____
a. otitis media
b. tinnitus
c. congenital deafness
d. vertigo
e. nerve deafness
ANSWER: a
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Why is penicillin selectively toxic to bacterial cells but harmless to human cells?
a. Penicillin is inactivated within lysosomes of human cells c. The glycocalyx of an animal cell provides a barrier through which penicillin cannot pass d. Penicillin specifically weakens peptidoglycan, which is found only in bacterial cells e. Human cells actively transport penicillin out of the cell
How many genes does a human Y chromosome carry?
a. 100 b. 1,400 c. 2,800 d. 14,000 e. 28,000
Ferns lack:a
rhizomes. b. seeds. c. vascular tissue. d. sexual reproduction. e. photosynthesis.
Variation among organisms is due to mutations
Indicate whether the statement is true or false