Which of the following does NOT regulate biochemical reactions? A. Regulation of
ID: 36176 • Letter: W
Question
Which of the following does NOT regulate biochemical reactions?
A. Regulation of enzyme amounts.
B. Regulation of access of substrates to certain compartments.
C. Alteration of DGo' by raising or lowering reactant concentrations.
D. Regulation of the catalytic activities of enzymes.
E. Alteration of the amounts of allosteric modifiers (regulator molecules).
12- The Krebs cycle can accurately be described as
a) a central metabolic pathway
b) an amphibolic pathway
c) a catabolic pathway
d) an anabolic pathway
e) all of the above
13. Which statement concerning enzyme catalyzed reactions is correct
A. the free energy of activation (DGact) is the difference in free energy in the substrate (initial state) and the free energy in the product
B. the transition state is a stable form of the enzyme and substrate
C. enzymes decrease the free energy of activation (DGact)
D. enzymes are consumed while catalyzing a reaction
E. enzymes alter the equilibrium constant
14. The standard free energy change for a metabolic pathway:
A. is positive for spontaneous pathways.
B. is inversely proportional to the rate of the overall pathway.
C. is lower in the presence of the pathway enzymes.
D. is the sum of all the individual standard free energy values.
E. depends on the free energy of the rate limiting reaction.
15 Metabolic pathways may be
a) Catabolic
b) Anabolic
c) Central
d) Anaplerotic
e) Amphibolic
f) all of the above
16. ATP is considered to be the universal source of energy for endergonic reactions but is not the storage form of energy under physiological conditions. Why?
A. The actual free energy of hydrolysis of ATP is only -11 to -12 kcal.
B. ATP is not located in the cytoplasm where most endergonic reactions occur.
C. The half-life of ATP is too short.
D. The synthesis rate for ATP is not efficient.
17 Which one of the following statements concerning Ca2+ is correct?
A. Intracellular concentration of Ca2+ is higher than that of the extracellular fluid.
B. The concentration of cytosolic Ca2+ is transiently decreased by activation of phospholipase C.
C. The effects of Ca2+ are most often mediated by calmodulin.
D. Ca2+ opposes the action of diacylglycerol on protein kinase C.
E. Intracellular Ca2+ is mostly free.
Explanation / Answer
Which of the following does NOT regulate biochemical reactions?
C. Alteration of DGo' by raising or lowering reactant concentrations.
12. e
13.c
14.d
15.f
16. c
17.c
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