The "motor unit" in vertebrate skeletal muscle refers to _____
A) one actin binding site and its myosin partner
B) one sarcomere and all of its actin and myosin filaments
C) one myofibril and all of its sarcomeres
D) one motor neuron and all of the muscle fibers on which it has synapses
D
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Darwin and Wallace's theory of evolution by natural selection was revolutionary because it _____
A) was the first theory to refute the ideas of special creation B) proved that individuals acclimated to their environment over time C) dismissed the idea that species are constant and emphasized the importance of variation and change in populations D) was the first time a biologist had proposed that species changed through time
Which of the following pairs perform essentially the same function in cells?
A. aquaporins and contractile vacuoles B. plasma membranes and cell walls C. turgor pressure and proton pumps D. electrochemical gradient and osmosis
Although the effects of an EPSP are subliminal, explain how EPSPs affect membrane potential. What will be an ideal response?
The temperature is nearly uniform throughout a lake
A. at all times due to winds causing constant mixing of the layers. B. never. The lake always has different temperature layers and they are reversed in winter and summer. C. during winter when the ice forms an insulating cover. D. by the end of the fall and spring overturn. E. during summer when the sunlight warms the surface and the wind mixes the layers.