A symptom is ________.
A. measurable by health care personnel
B. an objective indication of disease
C. a temperature
D. a subjective indication of disease
Answer: D
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During neuronal signaling, a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell. Which of the following helps establish the concentration gradient necessary for this process to occur?
A. Na+/K+ channel B. voltage-gated Na+ channel C. Na+ symporter D. Na+/K+ pump
How might a plant cope with the fact that the Calvin cycle uses more ATP than NADPH, yet produces roughly the same amount of both energy intermediates in photosystems I and II?
A. Increase the electrochemical gradient for H+ across the thylakoid membrane, producing more ATP but not NADPH. B. Electron flow rate can be increased, increasing both ATP and NADPH production. C. Plants often increase the amount of NADP reductase, thereby increasing NADPH production to match ATP output. D. More pigment can be rapidly created for greater photosynthetic capacity, producing equal amounts of ATP and NADPH. E. Photosynthesis can revert from a noncyclic to cyclic electron flow, producing more ATP than NADPH.
In terms of sex chromosomes, females have:
a. one X chromosome and one Barr body b. one X chromosome c. one X chromosome and one Y chromosome d. two active X chromosomes e. two Barr bodies
The complement cascade can be activated by binding to
A) natural killer cells only. B) antibodies attached to bacterial cells only. C) carbohydrates present on bacterial cells only. D) either carbohydrates or antibodies on bacterial cells. E) either natural killer cells or carbohydrates on bacterial cells.