Xylem sap is moved from the root system into what other structure in the plant body?
a. the tonoplast system
b. the shoot system
c. the taproots
d. the trichomes
Ans: b. the shoot system
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Looking at the data in the figure above from the hare/lynx experiment, what conclusion can you draw?
I) Food is a factor in controlling hare population size. II) Excluding lynx is a factor in controlling hare population size. III) The effect of excluding predators and adding food in the same experiment is greater than the sum of excluding lynx alone plus adding food alone. A) only I B) only II C) only III D) only II and III E) I, II, and III
Chronic high stress is associated with high cortisol levels that harm cells in the hippocampus, a brain region associated with ________
a. immune system regulation b. appetite control c. sexual function d. learning and memory
Photosynthetic pigments of algae are found in cells within:
a. chloroplasts. b. nuclei. c. cell walls. d. mitochondria. e. vacuoles.
Some drugs mimic a neurotransmitter's effect on a postsynaptic cell. For example, morphine and heroin bind to receptors for:
a. acetylcholine. b. dopamine c. adenosine d. serotonin e. endorphins