Question 1

Lactic acid produced by certain bacteria is used to curdle milk during cheese-making.

Accepted Answer

A) True 
 B)False

Question 2

Two molecules of ATP are consumed per glucose during the triose stage of glycolysis.

Accepted Answer

A) True 
 B)False

Question 3

Phosphofructokinase I deficiency results in

Accepted Answer

A)  an overproduction of Fructose 6-phosphate.
B)  an overproduction of Fructose 1,6-bisphosphate.
C)  fructose 1,6-bisphosphate deficiency.
D)  A and C only.
E)  All of the above.F) A) and E)
G) A) and B)

Question 4

The enzyme that catalyzes the conversion of pyruvate to lactate is ________.

Accepted Answer

A)  lactate reductase
B)  pyruvate kinase
C)  lactoenolpyruvate
D)  lactate dehydrogenaseE) B) and C)
F) A) and C)

Question 5

Insulin increases the capacity of a cell to transport glucose by

Accepted Answer

A)  forming more GLUT 4 vesicles.
B)  stimulating hexokinase.
C)  stimulating GLUTs 1,3 and others of the GLUT family.
D)  stimulating GLUT 4 vesicles to fuse with the plasma membrane.E) A) and C)
F) A) and B)

Question 6

Isozymes are different proteins from one species which catalyze different chemical reactions.

Accepted Answer

A) True 
 B)False

Question 7

2,3-bisphosphoglycerate is

Accepted Answer

A)  an essential component of glycolysis for ATP production.
B)  converted to 3-phosphoglycerate with formation of ATP.
C)  essential for the efficient release of O² from hemoglobin.
D)  a product of the enzyme phosphofructokinase.E) A) and D)
F) A) and C)

Question 8

Mutases are described as

Accepted Answer

A)  polymerases that catalyze phosphoryl group transfers.
B)  isomerases that catalyze the transfer of phosphoryl groups from one part of a substrate molecule to another.
C)  forming intermediate free phosphate (Pi) .
D)  All of the above.E) None of the above
F) A) and C)

Question 9

Glucose 6-phosphate allosterically inhibits

Accepted Answer

A)  hexokinase I.
B)  glucokinase.
C)  hexokinase II.
D)  All of the above
E)  A and C onlyF) B) and E)
G) A) and C)

Question 10

PFK-2 and fructose 2,6-bisphosphatase are two names for the same enzyme.The name PFK-2 is used for the enzyme's catalysis of the phosphorylation of fructose 6-phosphate to fructose 2,6-bisphosphate.The name fructose 2,6-bisphosphatase is used for its catalysis of the reverse reaction.What is unique about this enzyme that makes it logical to use two names?

Accepted Answer

A)  It is one of very few enzymes that can catalyze both the forward and reverse reactions.
B)  The enzyme is a monomer when catalyzing the phosphorylation reaction and a dimer when catalyzing the reverse reaction.
C)  The forward and reverse reactions occur in different compartments within the cell,so a different name is used for each activity.
D)  The enzyme is bifunctional.The forward and reverse reactions are catalyzed by different sites on the same enzyme.E) All of the above
F) A) and D)

Question 11

Under what situation might lactic acidosis occur?

Accepted Answer

A)  Lactate dehydrogenase is inactive.
B)  Transport of glucose into cells is accelerated.
C)  Oxygen supply to tissues is inadequate.
D)  PFK-1 is over-activated.E) A) and B)
F) None of the above

Question 12

Isozymes are enzymes

Accepted Answer

A)  from one species that catalyze the same reaction.
B)  from different species that catalyze the same reaction.
C)  that have isomers as substrates.
D)  that have products that are isomers.E) A) and B)
F) A) and C)

Question 13

An increase in blood insulin concentration increases the rate of glucose uptake in adipose tissue and striated muscle cells.

Accepted Answer

A) True 
 B)False

Question 14

The genetic disorder galactosemia can cause ________ in infants.

Accepted Answer

A)  inability to properly digest milk due to its galactose content
B)  jaundice
C)  damage to the nervous system
D)  liver damage
E)  All of the aboveF) B) and C)
G) A) and B)

Question 15

Which will be the main energy-producing degradation pathway for E.coli being grown on a medium where gluconate is the only carbon source?

Accepted Answer

A)  Embden-Meyeroff-Parnas.
B)  Entner-Doudoroff.
C)  Pentose phosphate.
D)  Gycolytic.E) A) and B)
F) A) and C)

Question 16

How would the liver normally respond under condition of high glucose?

Accepted Answer

A)  Phosphorylating glucose for entry into the glycolytic pathway.
B)  Saturating glucokinase with glucose.
C)  Phosphorylating glucose for entry into the glycogen synthesis pathways.
D)  A and B only.
E)  A and C only.F) A) and D)
G) C) and E)

Question 17

Arsenate

Accepted Answer

A)  competes with NAD+ for the binding site in 1,3-bisphosphoglycerate.
B)  competes with phosphate for its binding site in glyceraldehyde 3-phosphate dehydrogenase.
C)  produces a stable analog of 1,3-bisphosphoglycerate.
D)  All of the above.E) All of the above
F) A) and B)

Question 18

Which must be satisfied to obtain net flux toward product in a metabolic pathway?

Accepted Answer

A)  Each step in the pathway has an actual free energy change that is either negative or zero.
B)  The overall actual free energy change is negative.
C)  The net enthalpy is endothermic.
D)  A and B above.
E)  All of the above.F) B) and E)
G) All of the above

Question 19

Seven of the ten reactions in the glycolytic pathway have free energy values close to zero.What does this tell us about those reactions?

Accepted Answer

A)  They are near equilibrium reactions.
B)  They are not control points for pathway regulation.
C)  They are reversible reactions.
D)  All of the above.
E)  None of the above.F) A) and B)
G) B) and D)

Question 20

Glucagon triggers the adenylate cyclase signally pathway.This activates protein kinase A which phosphorylates serine residues.

Accepted Answer

A) True 
 B)False

Exam 11: Glycolysis

Isozymes are different proteins from one species which catalyze different chemical reactions.

Correct Answer
verified

Mutases are described as

Correct Answer
verified

Phosphofructokinase I deficiency results in

Correct Answer
verified

2,3-bisphosphoglycerate is

Correct Answer
verified

Two molecules of ATP are consumed per glucose during the triose stage of glycolysis.

Correct Answer
verified

Correct Answer
verified

Lactic acid produced by certain bacteria is used to curdle milk during cheese-making.

Correct Answer
verified

An increase in blood insulin concentration increases the rate of glucose uptake in adipose tissue and striated muscle cells.

Correct Answer
verified

Which must be satisfied to obtain net flux toward product in a metabolic pathway?

Correct Answer
verified

The genetic disorder galactosemia can cause ________ in infants.

Correct Answer
verified

Which will be the main energy-producing degradation pathway for E.coli being grown on a medium where gluconate is the only carbon source?

Correct Answer
verified

How would the liver normally respond under condition of high glucose?

Correct Answer
verified

Arsenate

Correct Answer
verified

Seven of the ten reactions in the glycolytic pathway have free energy values close to zero.What does this tell us about those reactions?

Correct Answer
verified

Glucagon triggers the adenylate cyclase signally pathway.This activates protein kinase A which phosphorylates serine residues.

Correct Answer
verified

Under what situation might lactic acidosis occur?

Correct Answer
verified

Insulin increases the capacity of a cell to transport glucose by

Correct Answer
verified

The enzyme that catalyzes the conversion of pyruvate to lactate is ________.

Correct Answer
verified

Isozymes are enzymes

Correct Answer
verified

Glucose 6-phosphate allosterically inhibits

Correct Answer
verified

Exam 11: Glycolysis

Isozymes are different proteins from one species which catalyze different chemical reactions.

Correct AnswerverifiedShow Answer

Mutases are described as

Correct AnswerverifiedShow Answer

Phosphofructokinase I deficiency results in

Correct AnswerverifiedShow Answer

2,3-bisphosphoglycerate is

Correct AnswerverifiedShow Answer

Two molecules of ATP are consumed per glucose during the triose stage of glycolysis.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Lactic acid produced by certain bacteria is used to curdle milk during cheese-making.

Correct AnswerverifiedShow Answer

An increase in blood insulin concentration increases the rate of glucose uptake in adipose tissue and striated muscle cells.

Correct AnswerverifiedShow Answer

Which must be satisfied to obtain net flux toward product in a metabolic pathway?

Correct AnswerverifiedShow Answer

The genetic disorder galactosemia can cause ________ in infants.

Correct AnswerverifiedShow Answer

Which will be the main energy-producing degradation pathway for E.coli being grown on a medium where gluconate is the only carbon source?

Correct AnswerverifiedShow Answer

How would the liver normally respond under condition of high glucose?

Correct AnswerverifiedShow Answer

Arsenate

Correct AnswerverifiedShow Answer

Seven of the ten reactions in the glycolytic pathway have free energy values close to zero.What does this tell us about those reactions?

Correct AnswerverifiedShow Answer

Glucagon triggers the adenylate cyclase signally pathway.This activates protein kinase A which phosphorylates serine residues.

Correct AnswerverifiedShow Answer

Under what situation might lactic acidosis occur?

Correct AnswerverifiedShow Answer

Insulin increases the capacity of a cell to transport glucose by

Correct AnswerverifiedShow Answer

The enzyme that catalyzes the conversion of pyruvate to lactate is ________.

Correct AnswerverifiedShow Answer

Isozymes are enzymes

Correct AnswerverifiedShow Answer

Glucose 6-phosphate allosterically inhibits

Correct AnswerverifiedShow Answer

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