Sunlight resets biological clocks in plants by activating and inactivating _____
a. phototropins c. photoperiodisms
b. phytochromes d. far-red light
B
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Sponges are atypical animals because they
(a) reproduce sexually. (b) are heterotrophic. (c) lack definite tissues. (d) are multicellular.
When a neuron undergoes a change in membrane potential that is proportional to (i.e., varies depending on) the strength of the stimulus given to that neuron, this is referred to as a/an
A. equilibrium potential. B. action potential. C. resting potential. D. reversal potential. E. graded potential.
Which of the following occurs subsequent to the
invasion of bacteria into a wound? a. complement activation b. capture of bacteria by lymph nodes c. binding of bacteria to B cells d. attraction of phagocytes by the chemotactic factors secreted by the bacteria e. all of these
Scientists can distinguish between DNA of different individuals, thus making this information useful in criminal investigations. The technique used is called
A. restriction fragment length polymorphisms. B. societal polymorphisms. C. Southern Blot. D. hybridization polymorphisms. E. molecular hybridization.