A relationship between two organisms in which both members benefit is said to be
a. parasitic.
b. saprotrophic.
c. mutualistic.
d. heterotrophic.
d
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Which of the following is a correct statement?
a. Cones respond to particular wavelengths (colors), rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors), cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than are rods. d. Nocturnal animals have a high concentration of cones in their eyes and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
The process by which the movement of internal bonds converts one type of organic compound to
another is a. condensation. b. cleavage. c. functional group transfer. d. electron transfer. e. rearrangement.
Which of the following best explains why anabolic steroid abuse by male athletes can lead to a decrease in testes size?
A) High levels of anabolic steroids cause the adrenal glands to release more estrogen. B) Circulating anabolic steroids increase the release of FSH and LH, which slow down growth and function of the testes. C) High levels of anabolic steroids increase the production of testosterone through positive feedback, which decreases the size of the testes. D) High levels of anabolic steroids decrease the production of testosterone through negative feedback, which decreases the size of the testes. E) Circulating anabolic steroids decrease the release of FSH and LH, which slow down growth and function of the testes.
Which of the following does NOT occur during the development of dental caries?
a. Streptococcus mutans uses dextran to attach to teeth and gums. a. Oral microflora produce high concentrations of exoenzymes when sucrose is present. b. Lactic acid dissolves calcium phosphate, causing decalcification of the tooth enamel. c. Oral biofilm microflora produce high concentrations of organic acids.