Question 1

A bowl of sugar water is very stable.But if you feed it to cells it is rapidly broken down into carbon dioxide and water.What is the best explanation for this observation?

Accepted Answer

A)  Glucose is removed from the cell by active transport.
B)  Cells use energy to break down glucose.
C)  Glucose cannot be broken down outside a cell.
D)  Glucose becomes more chemically reactive inside a cell.
E)  Enzymes in the cell catalyze the breakdown of glucosE.F) A) and C)
G) C) and D)

Question 2

The reaction: pyruvate + CoA + NAD+  →\rarr→  acetyl CoA + CO2 + NADH,is catalyzed by pyruvate dehydrogenase.If an inhibitor of this enzyme was added to cells levels of which compound would increase in the cytoplasm?

Accepted Answer

A)  NAD+
B)  Pyruvate
C)  Acetyl CoA
D)  CoA E) B) and D)
F) B) and C)

Question 3

In a PET scan a patient is injected with radioactively labeled glucose.Why would cancer cells take up more of the radioactive glucose than surrounding non-cancerous tissues?

Accepted Answer

A)  Because the produce more enzymes found in glycolysis.
B)  Because they are more sensitive to radiation.
C)  Because they require more oxygen to metabolize glucose.
D)  Because they rely more on oxidative phosphorylation than glycolysis to produce ATP.
E)  Because they are less sensitive to radiation.F) B) and D)
G) None of the above

Question 4

You measure the amount of enzyme activity in the presence of compound X and note that as you add more substrate the amount of enzyme activity increases.This indicates that the compound X is a

Accepted Answer

A)  competitive inhibitor.
B)  allosteric inhibitor.
C)  activator.
D)  enzyme.
E)  non-competitive inhibitor.F) B) and E)
G) C) and D)

Question 5

What processes will occur in the presence or absence of oxygen?

Accepted Answer

A)  glycolysis
B)  electron transport chain
C)  cellular respiration
D)  oxidative phosphorylation
E)  citric acid cycleF) D) and E)
G) B) and C)

Question 6

Assuming that the glycerol backbone of a fat molecule can be converted to glyceraldehyde-3-phosphate,an intermediate in glycolysis,how many ATP can be produced from the glycerol backbone of a fat molecule?

Accepted Answer

A)  8
B)  2
C)  12
D)  36
E)  18F) A) and E)
G) B) and D)

Question 7

When scientists placed ATP Synthase linked to fluorsecent actin on a microscope slide and added ATP,the actin could be seen spinning counterclockwise.If the experiment could be replicated in a cell going through oxidative phosphorylation what would happen?

Accepted Answer

A)  The actin would spin counterclockwise because ATP would be hydrolyzed.
B)  The actin would spin clockwise because ATP would be produced instead of hydrolyzed.
C)  The actin would spin counterclockwise because ATP would be produced instead of hydrolyzed.
D)  The actin would spin clockwise because ATP would be hydrolyzeD.E) B) and D)
F) A) and B)

Question 8

In the reaction pyruvate + CoA + NAD+  →\rarr→  acetyl CoA + CO2 + NADH

Accepted Answer

A)  pyruvate is oxidized and CoA is reduced.
B)  pyruvate is oxidized and NAD+ is reduced.
C)  pyruvate is reduced and CoA is oxidized.
D)  pyruvate is reduced and NAD+ is oxidizeD. E) C) and D)
F) A) and D)

Question 9

A reaction with a ? $>$ 
0 is endergonic and requires a net input of energy to procede.

Accepted Answer

A) True 
 B)False

Question 10

How many net ATP and NADH molecules are produced from one molecule of glucose during glycolysis?

Accepted Answer

A)  3 ATP,4 NADH
B)  4 ATP,2 NADH
C)  2 ATP,2 NADH
D)  2 ATP,6 NADH
E)  0 ATP,6 NADHF) A) and B)
G) None of the above

Question 11

In the reaction A- +B  →\rarr→ A + B-,

Accepted Answer

A)  molecule A is oxidized and molecule B is reduced.
B)  molecules A and B are both reduced.
C)  molecule A is reduced and molecule B is oxidized.
D)  molecule A is oxidized and molecule B is unchangeD.
E)  molecules A and B are both oxidzied. F) A) and E)
G) A) and D)

Question 12

Once ATP donates its phosphate to a coupled reaction it becomes ADP.The ADP can be converted back to ATP in a(an)

Accepted Answer

A)  endergonic reaction.
B)  exergonic reaction.
C)  oxidation reaction.
D)  hydrolysis reaction.
E)  equilibrium reaction.F) A) and E)
G) All of the above

Question 13

The proton motive force requires that the H+ concentration is lower in the intermembrane space than inside the matrix.

Accepted Answer

A) True 
 B)False

Question 14

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of

Accepted Answer

A)  negative feedback.
B)  positive feedback.
C)  denaturation.
D)  a coenzyme.
E)  equilibrium.F) A) and B)
G) B) and D)

Question 15

How does an enzyme work to catalyze a reaction?

Accepted Answer

A)  It raises the temperature of a reaction.
B)  It increases the concentration of the reactants in a reaction.
C)  It supplies the energy to speed up a reaction.
D)  It lowers the activation energy of a reaction.
E)  It allows the reaction to proceed through different intermediates.F) All of the above
G) A) and B)

Question 16

In a catabolic reaction,electrons from food are

Accepted Answer

A)  removed by reduction and stored in NADH.
B)  added by reduction and stored in ATP.
C)  added by oxidation and stored in ATP.
D)  added by reduction and stored in NADH.
E)  removed by oxidation and stored in NADH.F) A) and B)
G) D) and E)

Question 17

Metabolism refers to only those reactions that release energy.

Accepted Answer

A) True 
 B)False

Question 18

If oxygen is present,pyruvate will be converted to acetyl CoA in the mitochondrial matrix.

Accepted Answer

A) True 
 B)False

Question 19

When scientists placed ATP Synthase linked to fluorescent actin on a microscope slide and added ATP,the actin could be seen spinning.If the scientists instead added ADP what would happen?

Accepted Answer

A)  The actin would not spin because only ATP can move through the channel in ATP synthase.
B)  The actin would spin when ADP is phosphorylated to form ATP.
C)  The actin would not spin because it required ATP hydrolysis.
D)  The actin would spin because ADP can also move through the channel in ATP synthase.E) B) and D)
F) A) and D)

Question 20

When acetyl-CoA containing radioactively labeled carbon atoms is fed to cells,the CO2 produced is not initially radioactive.However,molecules of citrate and oxaloacetate are radioactive.Only after some time has passed will radioactive CO2 released.What is the best explanation for this observation?

Accepted Answer

A)  Acetyl groups are not metabolized directly into CO2,but enter a linear metabolic pathway.
B)  Acetyl groups are not metabolized directly into CO2,but enter a cyclical metabolic pathway.
C)  Acetyl groups first combine with citrate and oxaloacetate before being metabolized into CO2.
D)  Acetyl groups are metabolized directly into CO2.E) C) and D)
F) A) and B)

Exam 6: Energy, Enzymes, and Cellular Respiration

You measure the amount of enzyme activity in the presence of compound X and note that as you add more substrate the amount of enzyme activity increases.This indicates that the compound X is a

Correct Answer
verified

The proton motive force requires that the H⁺ concentration is lower in the intermembrane space than inside the matrix.

Correct Answer
verified

Correct Answer
verified

When scientists placed ATP Synthase linked to fluorescent actin on a microscope slide and added ATP,the actin could be seen spinning.If the scientists instead added ADP what would happen?

Correct Answer
verified

Assuming that the glycerol backbone of a fat molecule can be converted to glyceraldehyde-3-phosphate,an intermediate in glycolysis,how many ATP can be produced from the glycerol backbone of a fat molecule?

Correct Answer
verified

Once ATP donates its phosphate to a coupled reaction it becomes ADP.The ADP can be converted back to ATP in a(an)

Correct Answer
verified

In a catabolic reaction,electrons from food are

Correct Answer
verified

In the reaction A^- +B $\rarr$ A + B^-,

Correct Answer
verified

A reaction with a ? $>$ 0 is endergonic and requires a net input of energy to procede.

Correct Answer
verified

The reaction: pyruvate + CoA + NAD⁺ $\rarr$ acetyl CoA + CO₂ + NADH,is catalyzed by pyruvate dehydrogenase.If an inhibitor of this enzyme was added to cells levels of which compound would increase in the cytoplasm?

Correct Answer
verified

What processes will occur in the presence or absence of oxygen?

Correct Answer
verified

In a PET scan a patient is injected with radioactively labeled glucose.Why would cancer cells take up more of the radioactive glucose than surrounding non-cancerous tissues?

Correct Answer
verified

Metabolism refers to only those reactions that release energy.

Correct Answer
verified

If oxygen is present,pyruvate will be converted to acetyl CoA in the mitochondrial matrix.

Correct Answer
verified

How many net ATP and NADH molecules are produced from one molecule of glucose during glycolysis?

Correct Answer
verified

When scientists placed ATP Synthase linked to fluorsecent actin on a microscope slide and added ATP,the actin could be seen spinning counterclockwise.If the experiment could be replicated in a cell going through oxidative phosphorylation what would happen?

Correct Answer
verified

How does an enzyme work to catalyze a reaction?

Correct Answer
verified

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of

Correct Answer
verified

A bowl of sugar water is very stable.But if you feed it to cells it is rapidly broken down into carbon dioxide and water.What is the best explanation for this observation?

Correct Answer
verified

In the reaction pyruvate + CoA + NAD⁺ $\rarr$ acetyl CoA + CO₂ + NADH

Correct Answer
verified

Exam 6: Energy, Enzymes, and Cellular Respiration

You measure the amount of enzyme activity in the presence of compound X and note that as you add more substrate the amount of enzyme activity increases.This indicates that the compound X is a

Correct AnswerverifiedShow Answer

The proton motive force requires that the H+ concentration is lower in the intermembrane space than inside the matrix.

Correct AnswerverifiedShow Answer

When acetyl-CoA containing radioactively labeled carbon atoms is fed to cells,the CO2 produced is not initially radioactive.However,molecules of citrate and oxaloacetate are radioactive.Only after some time has passed will radioactive CO2 released.What is the best explanation for this observation?

Correct AnswerverifiedShow Answer

When scientists placed ATP Synthase linked to fluorescent actin on a microscope slide and added ATP,the actin could be seen spinning.If the scientists instead added ADP what would happen?

Correct AnswerverifiedShow Answer

Assuming that the glycerol backbone of a fat molecule can be converted to glyceraldehyde-3-phosphate,an intermediate in glycolysis,how many ATP can be produced from the glycerol backbone of a fat molecule?

Correct AnswerverifiedShow Answer

Once ATP donates its phosphate to a coupled reaction it becomes ADP.The ADP can be converted back to ATP in a(an)

Correct AnswerverifiedShow Answer

In a catabolic reaction,electrons from food are

Correct AnswerverifiedShow Answer

In the reaction A- +B →\rarr→ A + B-,

Correct AnswerverifiedShow Answer

A reaction with a ? >>> 0 is endergonic and requires a net input of energy to procede.

Correct AnswerverifiedShow Answer

The reaction: pyruvate + CoA + NAD+ →\rarr→ acetyl CoA + CO2 + NADH,is catalyzed by pyruvate dehydrogenase.If an inhibitor of this enzyme was added to cells levels of which compound would increase in the cytoplasm?

Correct AnswerverifiedShow Answer

What processes will occur in the presence or absence of oxygen?

Correct AnswerverifiedShow Answer

In a PET scan a patient is injected with radioactively labeled glucose.Why would cancer cells take up more of the radioactive glucose than surrounding non-cancerous tissues?

Correct AnswerverifiedShow Answer

Metabolism refers to only those reactions that release energy.

Correct AnswerverifiedShow Answer

If oxygen is present,pyruvate will be converted to acetyl CoA in the mitochondrial matrix.

Correct AnswerverifiedShow Answer

How many net ATP and NADH molecules are produced from one molecule of glucose during glycolysis?

Correct AnswerverifiedShow Answer

When scientists placed ATP Synthase linked to fluorsecent actin on a microscope slide and added ATP,the actin could be seen spinning counterclockwise.If the experiment could be replicated in a cell going through oxidative phosphorylation what would happen?

Correct AnswerverifiedShow Answer

How does an enzyme work to catalyze a reaction?

Correct AnswerverifiedShow Answer

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of

Correct AnswerverifiedShow Answer

A bowl of sugar water is very stable.But if you feed it to cells it is rapidly broken down into carbon dioxide and water.What is the best explanation for this observation?

Correct AnswerverifiedShow Answer

In the reaction pyruvate + CoA + NAD+ →\rarr→ acetyl CoA + CO2 + NADH

Correct AnswerverifiedShow Answer

Correct Answer
verified

The proton motive force requires that the H⁺ concentration is lower in the intermembrane space than inside the matrix.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the reaction A^- +B $\rarr$ A + B^-,

Correct Answer
verified

A reaction with a ? $>$ 0 is endergonic and requires a net input of energy to procede.

Correct Answer
verified

The reaction: pyruvate + CoA + NAD⁺ $\rarr$ acetyl CoA + CO₂ + NADH,is catalyzed by pyruvate dehydrogenase.If an inhibitor of this enzyme was added to cells levels of which compound would increase in the cytoplasm?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the reaction pyruvate + CoA + NAD⁺ $\rarr$ acetyl CoA + CO₂ + NADH

Correct Answer
verified