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BCH3025 Exam 3 Questions with Detailed
Verified Answers
Biological oxidation-reduction reactions always involve:
a. direct participation of oxygen
b. formation of water
c. mitochondria
d. transfer of electron(s)
Ans: D
The immediate precursors of DNA and RNA synthesis in the cell all contain:
a. 3' triphosphates
b. 5' triphosphates
c. adenine
d. deoxyribose
e. ribose
Ans: B
If the delta G of the reaction converting A to B is -40 kJ/mol, under standard
conditions the reaction:
a. is at equilibrium
b. will never reach equilibrium
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c. will not occur spontaneously
d. will proceed at a rapid rate
e. will proceed spontaneously from left to right
Ans: E
The oxidation of 3 mol of glucose by the pentose phosphate pathway may result in
the production of:
a. 2 mol of pentose, 4 mol of NADPH, and 8 mol of CO2
b. 3 mol of pentose, 6 mol of NADPH, and 3 mol of CO2
c. 4 mol of pentose, 6 mol of NADPH, and 6 mol of CO2
d. 4 mol of pentose, 3 mol of NADPH, and 3 mol of CO2
e. 3 mol of pentose, 4 mol of NADPH, and 3 mol of CO2
Ans: B
In the alcoholic fermentation of glucose by yeast, thiamine pyrophosphate is a
coenzyme required by:
a. aldolase
b. pyruvate decarboxylase
c. lactate dehydrogenase
d. transaldolase
e. hexokinase
Ans: B
Glycogen is converted to monosaccharide units by:
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a. glycogen synthase
b. glycogen phosphorylase
c. glucokinase
d. glucose-6-phosphatase
e. glycogenase
Ans: B
Glycogenin:
a. catalyzes the conversion of starch into glycogen
b. is the enzyme responsible for forming branches in glycogen
c. is the gene that encodes glycogen synthase
d. is the primer on which new glycogen chains are initaited
e. regulates the synthesis of glycogen
Ans: D
The glycogen-branching enzyme catalyzes:
a. degradation of (alpha 1 to 4) linkages in glycogen
b. formation of (alpha 1 to 4) linkages in glycogen
c. formation of (alpha 1 to 6) linkages during glycogen synthesis
d. glycogen degradation in tree branches
e. removal of unneeded glucose residues at the ends of the branches
Ans: C
Aside from maintaining the integrity of its hereditary material, the most important
general metabolic concern of a cell is:
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a. keeping its glucose levels high
b. maintaining a constant supply and concentration of ATP
c. preserving its ability to carry out oxidative phosphorylation
d. protecting its enzymes from rapid degradation
e. running all its major metabolic pathways at maximum efficiency
Ans: B
Which of the following cofactors is required for the conversion of succinate to
fumarate in the citric acid cycle?
a. ATP
b. Biotin
c. FAD
d. NAD+
e. NADP+
Ans: C
A function of the glyoxylate cycle, in conjunction with the citric acid cycle, is to
accomplish the:
a. complete oxidation of acetyl-CoA to CO2 plus reduced coenzymes
b. net conversion of lipid to carbohydrate
c. net synthesis of four-carbon dicarboxylic acids from acetyl-CoA
d. net synthesis of long-chain fatty acids from citric acid cycle intermediates fro, acetyl-
CoA
e. net conversion of lipid to carbohydrate and net synthesis of four-carbon dicarboxylic
acids from acetyl-CoA
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BCH3025 Exam 3 Questions with Detailed
Verified Answers
Biological oxidation-reduction reactions always involve:
a. direct participation of oxygen
b. formation of water
c. mitochondria
d. transfer of electron(s)
Ans: D
The immediate precursors of DNA and RNA synthesis in the cell all contain:
a. 3' triphosphates
b. 5' triphosphates
c. adenine
d. deoxyribose
e. ribose
Ans: B
If the delta G of the reaction converting A to B is -40 kJ/mol, under standard
conditions the reaction:
a. is at equilibrium
b. will never reach equilibrium
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c. will not occur spontaneously
d. will proceed at a rapid rate
e. will proceed spontaneously from left to right
Ans: E
The oxidation of 3 mol of glucose by the pentose phosphate pathway may result in
the production of:
a. 2 mol of pentose, 4 mol of NADPH, and 8 mol of CO2
b. 3 mol of pentose, 6 mol of NADPH, and 3 mol of CO2
c. 4 mol of pentose, 6 mol of NADPH, and 6 mol of CO2
d. 4 mol of pentose, 3 mol of NADPH, and 3 mol of CO2
e. 3 mol of pentose, 4 mol of NADPH, and 3 mol of CO2
Ans: B
In the alcoholic fermentation of glucose by yeast, thiamine pyrophosphate is a
coenzyme required by:
a. aldolase
b. pyruvate decarboxylase
c. lactate dehydrogenase
d. transaldolase
e. hexokinase
Ans: B
Glycogen is converted to monosaccharide units by:
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a. glycogen synthase
b. glycogen phosphorylase
c. glucokinase
d. glucose-6-phosphatase
e. glycogenase
Ans: B
Glycogenin:
a. catalyzes the conversion of starch into glycogen
b. is the enzyme responsible for forming branches in glycogen
c. is the gene that encodes glycogen synthase
d. is the primer on which new glycogen chains are initaited
e. regulates the synthesis of glycogen
Ans: D
The glycogen-branching enzyme catalyzes:
a. degradation of (alpha 1 to 4) linkages in glycogen
b. formation of (alpha 1 to 4) linkages in glycogen
c. formation of (alpha 1 to 6) linkages during glycogen synthesis
d. glycogen degradation in tree branches
e. removal of unneeded glucose residues at the ends of the branches
Ans: C
Aside from maintaining the integrity of its hereditary material, the most important
general metabolic concern of a cell is:
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a. keeping its glucose levels high
b. maintaining a constant supply and concentration of ATP
c. preserving its ability to carry out oxidative phosphorylation
d. protecting its enzymes from rapid degradation
e. running all its major metabolic pathways at maximum efficiency
Ans: B
Which of the following cofactors is required for the conversion of succinate to
fumarate in the citric acid cycle?
a. ATP
b. Biotin
c. FAD
d. NAD+
e. NADP+
Ans: C
A function of the glyoxylate cycle, in conjunction with the citric acid cycle, is to
accomplish the:
a. complete oxidation of acetyl-CoA to CO2 plus reduced coenzymes
b. net conversion of lipid to carbohydrate
c. net synthesis of four-carbon dicarboxylic acids from acetyl-CoA
d. net synthesis of long-chain fatty acids from citric acid cycle intermediates fro, acetyl-
CoA
e. net conversion of lipid to carbohydrate and net synthesis of four-carbon dicarboxylic
acids from acetyl-CoA
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