An atom that has lost electrons is a
A. cation.
B. neutral atom.
C. molecule.
D. anion.
A. cation.
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In the blood clotting process, platelets arrive at the site of damage and start secreting substances to attract more platelets. More platelets arrive at the site and secrete attractants to recruit more platelets. This is an example of:
A. negative feedback. B. positive feedback. C. feedforward regulation. D. electrical signaling.
How would you best explain the existence of a mountain range that has abundant conifer trees, ferns, and mosses on the east side, but only sparse shrubby plants on the west side?
A. Adiabatic cooling leads to temperature gradients that produce the differing plant communities. B. Differences in solar intensity produce the differing plant communities. C. Precipitation differences due to a rain shadow on the west side produce the differing plant communities. D. Differences in the specific heat of the two sides of the mountain produce the differing plant communities.
The primary reason steroid hormones usually act slowly is that _____
Fill in the blank(s) with the appropriate word(s).
Viruses can enter animal cells by
A. endocytosis. B. exocytosis. C. poking holes in their membranes and entering. D. triggering an active transport mechanism.