By what means are amino acids absorbed by the small intestine?
a. diffusion
b. facilitated diffusion
c. osmosis
d. passive transport
e. active transport
E
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Transcription begins near a site in the DNA called the ______.
A. promoter B. enhancer C. response element D. transcription unit E. regulatory sequence
Which of the following would occur if excess sweating led to dehydration and high salt concentration in the bloodstream?
A. The hypothalamus would signal the kidneys to release more salt into the urine. B. The hypothalamus would signal the kidneys to absorb more salt from the urine. C. The liver would signal the kidneys to absorb more salt from the urine. D. The liver would signal the kidneys to release more salt from the urine. E. None of the answer choices is correct.
Which of the following would most likely form electrolytes in water?
a. glucose b. ethanol c. an organic compound d. an inorganic compound e. a nonionic compound
Rhizobia help plants meet their ____ requirements by producing ____
a. nitrogen; NH3 b. phosphorus; PO4 c. potassium; K2O d. nitrogen; NO3 e. phosphorus; ATP