The first animals evolved ________.
A. 600 thousand years ago
B. 6 thousand years ago
C. 600 million years ago
D. 60 thousand years ago
Answer: C
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During a contraction, muscles DO NOT _____.
a. shorten in length. b. generate heat due to aerobic respiration. c. all require involuntary control of muscle cells. d. are first excited before the contraction can occur. e. all of these
You do an experiment in which you increase the concentration of phosphate in a solution and measure the uptake by plant cells. You find that once the concentration of phosphate reaches 1 gram per liter adding more phosphate does not increase uptake any further. From this you would conclude that phosphate is taken up by ________.
A. endocytosis. B. osmosis. C. exocytosis. D. facilitated diffusion. E. active transport.
An eight-year-old girl in rural Wisconsin has chills, headache, and fever and reports having been bitten by mosquitoes. How would you confirm your diagnosis of arboviral encephalitis?
A) ELISA test for IgM antibodies B) brain biopsy for Negri bodies C) Gram stain of cerebrospinal fluid D) examination of local mosquitoes E) complement fixation test for IgG antibodies
A typical fat molecule has ____ fatty acid tails
a. one b. two c. three d. four e. five