Which of the following is NOT associated with a higher cancer risk?
a. hormone therapy
b. safe sex
c. smoking
d. use of alcohol
e. exposure to certain hazardous chemicals in the workplace
b. safe sex
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Identification and location of genes on chromosomes that might affect cholesterol metabolism has been difficult because many of the genes that affect this trait interact, a phenomenon that is called epistasis
A. true B. false
The nervous system determines the pitch of a tone by
A) the region of the basilar membrane that is vibrating most vigorously. B) the peak amplitude of basilar membrane displacement. C) sites along the basilar membrane where vibrations are longest. D) the frequency of oval window vibration.
What is the benefit of sexual reproduction in protists?
A) fast increase in numbers B) availability of more environments C) greater variation among offspring D) ease of finding a mate
Both chemiosmosis and photophosphorylation involve (electron/proton/hydroxyl) gradients.
Fill in the blank(s) with the appropriate word(s).