Where do the molecules used as the inputs of the Calvin cycles (ATP and NADPH) come from?
A) They come from the sun.
B) They come from the light reactions.
C) They come from the air.
D) They come from previous Calvin cycles.
B
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What molecule is responsible for carrying the acetyl group from pyruvate into the citric acid cycle?
a. NADH b. FADH2 c. ATP d. CoA e. oxaloacetate
Eight species of woodpeckers coexist in Oregon forests. All feed on insects and nest in hollow trees, but the details of their foraging behavior and nesting preferences vary. What does this best illustrate?
a. competition b. social parasitism c. predation d. parasitoidism e. resource partitioning
Which component of a nephron receives fluid from the loop of the nephron?
A. glomerular capsule B. collecting duct C. distal convoluted tubule D. proximal convoluted tubule
As a result of receptor up-regulation:a
the number of genes that code for a receptor increases. b. the sensitivity of a cell to a hormone decreases. c. the number of receptors decreases. d. the concentration of hormone molecules in the blood increases. e. a hormone's signal is amplified