If you exposed a C4 plant to 14CO2 in the light, which would be the first organic molecule labeled with 14C?
A. oxaloacetate
B. malate
C. phosphoenolpyruvate (PEP)
D. pyruvate
Answer: A
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Consider a biochemical pathway with five steps that lead to the production of product Q. If there is an abundance of product Q, the most efficient way to slow down the entire pathway would be to regulate ________.
A. the last enzyme in the pathway B. every enzyme in the pathway C. the first enzyme in the pathway
When does the phosphodiesterase that is required to deactivate cAMP exist in the cell?
a. It is synthesized in response to increasing cAMP concentrations. b. It is actively absorbed from the intercellular medium by the cell. c. Phosphodiesterase is always present in the cell. d. Phosphodiesterase is a byproduct of cAMP hydrolysis.
Which of the following represents the chemical formula for urea?
a. H2N-CO-NH2 b. NH4Cl c. NH3 d. C5H4N4O3
The chemical bond energy in which of the following
molecules is a consequence of the second law of thermodynamics? a. fats b. glucose c. proteins d. ATP e. all of these