Which of the following does NOT occur during the Calvin cycle?
A) oxidation of NADPH
B) release of oxygen
C) regeneration of the CO2 acceptor
D) consumption of ATP
B
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Stem cells have the ability to differentiate to form specific cell types, which divide only slowly or not at all
a. True b. False Indicate whether the statement is true or false
Cells CANNOT communicate with each other by means of _______
a. gap junctions. b. plasmodesmata c. a molecule that diffuses through the extracellular fluid. d. desmosomes. e. hormones
Which of the following statements about the herbicide atrazine is false? a. Atrazine is used for weed control, mostly in cornfields
b. Atrazine from agricultural runoff persists in soil and water for decades. c. Atrazine causes or contributes to frog deformities. d. Male frogs exposed to atrazine at levels below those allowed in drinking water develop ovary tissue.
When muscles are exercised extensively in the absence of sufficient oxygen
a. a large amount of ATP is formed b. NADH molecules split c. lactic acid is produced d. oxidative respiration ceases