The plant hormone structurally similar to adenine is ____
a. brassinosteroid
b. abscisic acid
c. ethylene
d. cytokinin
e. systemin
ANSWER: d
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The immune system normally discriminates between ________ antigens.
A. primary and secondary response B. B and T cells C. self and nonself D. humoral and cell-mediated
The longest segment of the gut is the
a. cecum b. small intestine c. esophagus d. colon e. rectum
Nitrogen-fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants, and in exchange, the bacteria obtain food from the plants. Which reaction can these bacteria catalyze?
A. nitrogen gas (N2) to nitrate (NO3) B. ammonium (NH4+) to nitrate (NO3) C. nitrogen gas (N2) to ammonium (NH4+) D. nitrate (NO3) to ammonium (NH4+) E. nitrate (NO3) to nitrogen gas (N2)
Chainlike bacteria are generally called: