Where is phloem sap moved to?
a. to the root system
b. to sinks
c. to the shoot system
d. to sources
Ans: b. to sinks
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What happens when a ligand binds to a ligand-gated sodium channel?
A. Sodium ions flow passively from high concentration to low concentration. B. Sodium ions are pumped from low concentration to high concentration. C. Sodium ions flow passively from low concentration to high concentration. D. There is no net flow of sodium ions.
Which of the letters in the above figure
represents male structures? a. A b. B c. C d. D e. more than one of these
All of the following are true of the natural killer cells
(NK cells) EXCEPT that they a. are most active in innate responses. b. are central to adaptive immunity, like B and T cells. c. alert the immune system to the presence of antigens. d. kill weakened or dying body cells. e. combat viral infections and cancer.
The instructions for producing and maintaining life are contained in what molecule?
What will be an ideal response?