The signaling molecule nitric oxide (NO) functions
a. by binding its cell surface receptor and triggering an intracellular signaling cascade.
b. by diffusing across the membrane and binding its intracellular receptor, which then activates transcription.
c. on cells located far from the cells where it was synthesized.
d. by diffusing across the cell membrane and changing the activities of intracellular enzymes.
Ans: b. by diffusing across the membrane and binding its intracellular receptor, which then activates transcription.
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Loss of water from the aerial parts of plants is called _____
A) dehydration B) high heat of vaporization C) respiration D) gas exchange E) transpiration
Why is it virtually impossible to stamp out a disease caused by a zoonotic virus?
A. You'd have to drive the vector organism extinct to do so. B. Many vector organisms have multiple stages of their life cycle that can carry a zoonotic virus, which complicates controlling the vector-borne transmission. C. Many viruses transmitted in this manner may utilize more than one vector organism. D. Many zoonotic viruses may be able to reside in more than one host organism, complicating control measures. E. All of the above are correct.
The use of fat as an energy storage tissue evolved due to
a. a diet that was high in fat. b. the frequent inability to obtain food. c. a diet high in carbohydrates. d. excess food intake. e. the need for insulation.
Which of the following statements does NOT describe an essential element?
a. An element with only one role in plant metabolism may still be essential. b. An essential element is necessary for normal growth and reproduction. c. Plant seeds in some cases contain enough of an essential element to sustain the adult plant. d. An essential element may occasionally be functionally replaced by another element