The sex hormones of many animals are a specific type of lipid molecule known as
a. fatty acid.
b. phospholipid.
c. carotenoid.
d. steroid.
e. lipoprotein.
D
Biology & Microbiology
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A nonprotein component of an enzyme that is usually a metal ion or small organic molecule is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
a. digestive tract. b. respiratory tract. c. circulatory system. d. muscular system.
Biology & Microbiology
The response of plants to touch is known as
A. phototropism. B. thigmotropism. C. gravitropism. D. photoperiodism.
Biology & Microbiology
People living in the northeastern United States are more at risk for exposure to which of the following rickettsias?
A) Rickettsia rickettsii B) Rickettsia typhi C) Ehrlichia chaffeensis D) Orientia tsutsugamushi E) Rickettsia prowazekii
Biology & Microbiology