A one-way relationship in which one species benefits at the expense of another is called ____
a. commensalism
b. symbiosis
c. parasitism
d. mutualism
e. interspecific competition
c
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Which of the following is NOT a component of the translation machinery?
A. mRNA B. tRNA C. translation factors D. ribosomes E. protein polymerase
What is the primary function of the transverse tubules?
A. They attach muscle fibers to skeletal elements to exert force. B. They conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. C. They act as a channel for Ca2+ ions during excitation-contraction coupling. D. They attach troponin to tropomyosin. E. They form cross-bridges between actin and myosin during muscle contraction.
Oysters and many other mollusks produce many offspring of which only a few survive to adulthood and then have little risk of predation with their strong adult shells. Oysters are an example of an organism with a type ______ survivorship curve.
A. 0 B. I C. II D. III E. IV
Which gland secretes hormones that enable the body to respond to stress?
A) pancreas B) adrenal C) pineal D) parathyroid