The pitch of a sound depends on the ____of the sound wave
a. wavelength
b. amplitude
c. frequency
d. type
e. substance
ANSWER: c
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Which of the following is not a local regulator?
a. histamine b. prostaglandins c. nitric oxide d. growth factors e. insulin
Birds that live in marine environments, and thus lack access to fresh drinking water, _____
A) osmoregulate without using a transport epithelium for this purpose B) drink seawater and secrete excess ions through their kidneys only C) drink seawater and secrete excess ions mainly through their nasal salt glands D) have plasma that is isoosmotic to ocean water E) obtain water by eating only osmoregulating prey
Which of the following animals undergoes rotational cleavage?
A. echinoderms B. annelids C. amphibians D. mammals E. reptiles
Which one of the following is true regarding viruses?
a) Virions contain both DNA and RNA. b) They multiply by binary fission. c) They are sensitive to antibiotics. d) They are not composed of cells.