As a pond starts to dry out at the end of the rainy spring season, a researcher notices that toads
burrow into the soil where they can hibernate for up to nine months. What is the benefit of
hibernation?
a. reduced metabolic rate that ensures survival
b. increased body temperature that ensures survival
c. a period of time during which the animal completes sexual maturity
d. all of these
A
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Mitosis separates chromosomes. Cytoplasm is divided between two daughter cells by _____
A) cloning B) cytokinesis C) binary fission D) the formation of kinetochores
The Salk vaccine
A. protects against nervous system and gastrointestinal infection. B. protects only against gastrointestinal infection. C. is a subunit vaccine. D. protects only against nervous system infection. E. protects against nervous system and gastrointestinal infection AND is a subunit vaccine.
Bob dreamt he was biking for five hours. The actual time he was in ____ sleep was about ____ min
a. beta; 15?20 b. EEG; 10?15 c. REM; 60?90 d. REM; 10?15 e. EEG; 90
In a marine environment, animals that are isoosmotic relative to their environment __________.
a. experience no net water loss by osmosis b. experience significant water gain by osmosis c. experience significant water loss by osmosis d. must expend energy on the active transport of solutes from their bodies to the environment e. can only survive in terrestrial environments