The land plants are probably descendants of which of these groups?
a) green algae
b) red algae
c) brown algae
d) angiosperms
Ans: a) green algae
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Which one of the following is not one of the major elements that make up 96 percent of all
living organisms?
a. carbon b. oxygen c. helium d. nitrogen
. A research strain of mice has a mutation that causes voltage-gated sodium channels to take longer to return to the active state after a spike. What is the likely consequence for transduction of sensory stimuli?
A. There will be no effect on sensory perception, because sensory information relies on stimulus-gated ion channels and not voltage-gated ion channels. B. Sensory information will be incorrectly perceived as high intensity stimuli, due to the increased frequency of action potentials. C. The mutation will interfere with the ability of stimuli to create receptor potentials, and thus the neuron will fire with slow, broad action potentials, giving the animal enhanced sensory perception. D. Due to a longer refractory period, the neuron will be unable to conduct high frequency action potentials, and thus will not effectively transmit information about strong stimuli. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about action potentials? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The practice of using bacteria to remove pollutants from the environment is called ________.
A. Transduction B. Bioelimination C. Nitrogen fixation D. Bioremediaton
What is happening during the latent period of a muscle twitch?
A. The muscle relaxes and returns to its former length. B. The neurotransmitter is diffusing across the synaptic cleft, causing an electrical signal in the muscle cell. C. The myosin-actin cross-bridges are broken and the sarcomere shortens. D. ADP and phosphate are released, and the power stroke of the contraction occurs. E. Fresh ATP binds to the myosin, causing it to return to its resting position.