Who believed that once a mature community was established, its species composition was at equilibrium?
a. Clements
b. Gleason
c. Darwin
d. Whittaker
e. Connell
ANSWER: a
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What is the role of myelin in neurons?
A. To change the direction that Na+ and K+ move through ion channels during the action potential B. To increase the speed that action potentials travel down the neuron C. To prevent the neuron from generating action potentials D. To cause multiple sclerosis when present and intact, as it blocks action potential movement and must be envied by the immune system
In the dark, the Na+ channels in the outer segments of rod cells are
A. open. B. closed. C. important in making the cell hyperpolarized in this resting state. D. primarily affected by inhibitory neurotransmitter input.
Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?
A. Exposing organisms to the air on a benchtop so they completely dry out is an example of using osmotic pressure as a means of microbial control. B. Exposing a microbe to a hypertonic environment draws water out of the cell, causing plasmolysis. C. Salts and sugars external to a microbe create a hypotonic environment, which causes lysis of the cell. D. Salt is an effective solute to create an osmotic pressure gradient outside of a cell; however, the use of sugar, such as in jams and jellies, works via a different mechanism.
During which stage of meiosis do the sister chromatids separate?
a. metaphase I b. anaphase I c. metaphase II d. anaphase II e. telophase II