BCH 3025 Exam 3 Questions Answered Correctly Latest Update 2025-2026
Biological oxidation-reduction reactions always involve:
a. direct participation of oxygen
b. formation of water
c. mitochondria
d. transfer of electron(s) - Answers 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 - Answers 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
c. will not occur spontaneously
d. will proceed at a rapid rate
e. will proceed spontaneously from left to right - Answers 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 - Answers 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 - Answers B
Glycogen is converted to monosaccharide units by:
a. glycogen synthase
b. glycogen phosphorylase
c. glucokinase
d. glucose-6-phosphatase
e. glycogenase - Answers 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 - Answers 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 - Answers C
Aside from maintaining the integrity of its hereditary material, the most important general
metabolic concern of a cell is:
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 - Answers 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+ - Answers 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
Biological oxidation-reduction reactions always involve:
a. direct participation of oxygen
b. formation of water
c. mitochondria
d. transfer of electron(s) - Answers 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 - Answers 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
c. will not occur spontaneously
d. will proceed at a rapid rate
e. will proceed spontaneously from left to right - Answers 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 - Answers 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 - Answers B
Glycogen is converted to monosaccharide units by:
a. glycogen synthase
b. glycogen phosphorylase
c. glucokinase
d. glucose-6-phosphatase
e. glycogenase - Answers 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 - Answers 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 - Answers C
Aside from maintaining the integrity of its hereditary material, the most important general
metabolic concern of a cell is:
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 - Answers 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+ - Answers 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
