Which of the following statements about plant hormones is false?
a. They are organic compounds that act as a highly specific chemical signal.
b. They are effective in extremely small amounts.
c. They elicit many different responses.
d. They stimulate a response at one concentration and inhibit that same response at a
different concentration.
e. They can be categorized into seven major classes.
E
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The disease anthrax is caused by a species belonging to which genus?
A. Bacillus B. Ehrlichia C. Kingella D. Vibrio
Observing a patient who has been given an experimental drug, you notice that it constricts blood vessels and slows digestion, making its effects similar to those of
A. calcitonin. B. epinephrine. C. insulin. D. glucagon. E. testosterone.
Which of the following is NOT true of exotoxins?
A. exotoxins are part of the bacterial cell wall B. they are usually made of protein C. Some are enterotoxins D. Some are neurotoxins E. All of the above are TRUE of exotoxins
Which of the situations below will enhance microtubule shrinkage?
(a) addition of a drug that inhibits GTP exchange on free tubulin dimers (b) addition of a drug that inhibits hydrolysis of the GTP carried by tubulin dimers (c) addition of a drug that increases the affinity of tubulin molecules carrying GDP for other tubulin molecules (d) addition of a drug that blocks the ability of a tubulin dimer to bind to ?-tubulin