Each motor unit is composed of ____
a. both slow and fast aerobic muscle fibers
b. both fast aerobic and anaerobic fibers
c. all types of muscle fibers mixed together
d. only one type muscle fiber
e. both slow and fast anaerobic muscle fibers
ANSWER: d
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A population in ecology is defined as ________
A) a group of organisms, all from the same species B) a group of organisms, some from the same species, some from other species C) a group of organisms, some from the same species, some from other species, and their surrounding environment D) one organism and its surrounding environment
Which sentence best describes the situation that occurs when an enzyme and its substrate interact?
a. Just after substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate. b. Just before substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate. c. Just before substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme. d. Just after substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme.
Which of the following statements about stratified temperate zone lakes is NOT true?
A. Temperature gradients change from summer to winter. B. Solar radiation warms the surface layers in summer. C. Rich nutrients from the continual production of detritus accumulate near the surface of the lake. D. Populations of plankton and zooplankton depend on both sunlight and nutrient levels. E. Wind aids in the circulation of water.
There is a cure for transmissible spongiform encephalopathies.
a. true b. false