Question 1

The amino acids must be first __________ before they can be used in catabolic reactions.

Accepted Answer

A) stripped 
B) proteins 
C) deoxygenated 
D) deaminated 
A) stripped 
B) proteins 
C) deoxygenated 
D) deaminated

Question 2

Which of the following molecules does not cross the inner membrane of the mitochondria?

Accepted Answer

A) ATP 
B) acetyl-CoA 
C) pyruvate 
D) oxygen 
A) ATP 
B) acetyl-CoA 
C) pyruvate 
D) oxygen

Question 3

The reaction,C6H6O6 + 6O2 = 6 CO2 + 6 H2O,when it occurs in living cells is known as

Accepted Answer

A) aerobic fermentation. 
B) anaerobic fermentation. 
C) aerobic respiration. 
D) glycolysis. 
E) oxidative phosphorylation. 
A) aerobic fermentation. 
B) anaerobic fermentation. 
C) aerobic respiration. 
D) glycolysis. 
E) oxidative phosphorylation.

Question 4

Intermediate in glycolysis;finally oxidized to pyruvate.

Accepted Answer

A) ATP 
B) FAD 
C) G3P 
D) NAD+ 
E) acetyl-CoA 
A) ATP 
B) FAD 
C) G3P 
D) NAD+ 
E) acetyl-CoA

Question 5

Which of the following statements about fermentation is false?

Accepted Answer

A) Fermentation takes place only in the absence of oxygen. 
B) The recipient of hydrogen atoms is an organic molecule. 
C) Water is not one of the by-products. 
D) The Krebs cycle and electron transfer system do not occur. 
E) Cells can only undergo one type of fermentation. 
A) Fermentation takes place only in the absence of oxygen. 
B) The recipient of hydrogen atoms is an organic molecule. 
C) Water is not one of the by-products. 
D) The Krebs cycle and electron transfer system do not occur. 
E) Cells can only undergo one type of fermentation.

Question 6

The enzymes of the Krebs cycle are located in the

Accepted Answer

A) cytoplasm. 
B) inter-membrane space of mitochondria. 
C) vesicles of the ER. 
D) outer membrane of the mitochondria. 
E) matrix of the mitochondria. 
A) cytoplasm. 
B) inter-membrane space of mitochondria. 
C) vesicles of the ER. 
D) outer membrane of the mitochondria. 
E) matrix of the mitochondria.

Question 7

In the absence of oxygen,hydrogen atoms generated by glycolysis are donated to organic molecules in a process called

Accepted Answer

A) fermentation. 
B) decarboxylation. 
C) chemiosmosis. 
D) electron transport chain reactions. 
E) acetyl-CoA formation. 
A) fermentation. 
B) decarboxylation. 
C) chemiosmosis. 
D) electron transport chain reactions. 
E) acetyl-CoA formation.

Question 8

The chemical 2,4 dinitrophenol (DNP)is used in the manufacturing of dyes,wood preservatives,explosives,and insect control substances,and as a photographic developer.Products containing DNP are toxic because DNP uncouples oxidative phosphorylation.In a cell exposed to DNP,how many ATP molecules would be generated per molecule of glucose?

Accepted Answer

A) 2 
B) 4 
C) 36 
D) 38 
A) 2 
B) 4 
C) 36 
D) 38

Question 9

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C02 molecule.This process is known as ___________.

Accepted Answer

A) decarboxylation 
B) glycolysis 
C) The Kreb's cycle 
D) metabolism 
A) decarboxylation 
B) glycolysis 
C) The Kreb's cycle 
D) metabolism

Question 10

Since membranes are relatively impermeable to ions,most of the protons re-enter the matrix by passing through special channels in the inner mitochondrial membrane.Because of the inward flow of protons these channels allow the synthesis of

Accepted Answer

A) ADP from ATP and Pi. 
B) ATP from ADP and Pi. 
C) glucose from pyruvate. 
D) acetyl-CoA from pyruvate. 
E) citrate from oxaloacetate and acetyl-CoA. 
A) ADP from ATP and Pi. 
B) ATP from ADP and Pi. 
C) glucose from pyruvate. 
D) acetyl-CoA from pyruvate. 
E) citrate from oxaloacetate and acetyl-CoA.

Question 11

The decarboxylation step of oxidation of pyruvate takes place in the

Accepted Answer

A) cytoplasm. 
B) Golgi body. 
C) ribosome. 
D) mitochondrion. 
E) nucleus. 
A) cytoplasm. 
B) Golgi body. 
C) ribosome. 
D) mitochondrion. 
E) nucleus.

Question 12

All of the following are the end products of glycolysis except

Accepted Answer

A) pyruvate. 
B) ATP. 
C) NADH. 
D) NAD+. 
E) energy. 
A) pyruvate. 
B) ATP. 
C) NADH. 
D) NAD+. 
E) energy.

Question 13

The energy released in the mitochondrial electron transport chain is used to transport protons into the

Accepted Answer

A) matrix. 
B) cytoplasm. 
C) ER. 
D) inter-membrane space of mitochondria. 
E) enzyme complex of the Krebs cyclE. 
A) matrix. 
B) cytoplasm. 
C) ER. 
D) inter-membrane space of mitochondria. 
E) enzyme complex of the Krebs cyclE.

Question 14

Organisms that can manufacture their own chemical energy sources are called _____________.

Accepted Answer

A) autotrophs 
B) heterotrophs 
C) oligotrophs 
D) chemotrophs 
A) autotrophs 
B) heterotrophs 
C) oligotrophs 
D) chemotrophs

Question 15

Cytochromes are respiratory proteins.Which of the following statements accurately reflects their true nature?

Accepted Answer

A) Cytochrome proteins reside free in the lung cells of all vertebrates.These molecules contain a heme group with an iron atom at its center. 
B) Cytochrome proteins reside in the mitochondria and are specifically associated with the electron transport system. 
C) Cytochrome proteins reside in the mitochondria and are specifically associated with the Kreb cycle. 
D) Cytochrome proteins reside in the mitochondria and are specifically associated with glycolysis. 
A) Cytochrome proteins reside free in the lung cells of all vertebrates.These molecules contain a heme group with an iron atom at its center. 
B) Cytochrome proteins reside in the mitochondria and are specifically associated with the electron transport system. 
C) Cytochrome proteins reside in the mitochondria and are specifically associated with the Kreb cycle. 
D) Cytochrome proteins reside in the mitochondria and are specifically associated with glycolysis.

Question 16

A biochemist wants to control the initial substrate-level phosphorylation that occurs in the tracheal cells of grasshoppers once glucose has crossed the plasma membrane.This means that he will

Accepted Answer

A) have to prevent cAMP from entering the tracheal cells. 
B) have to prevent pyruvate reduction from occurring. 
C) have to prevent glycolysis from occurring in the mitochondria. 
D) have to prevent glycolysis from occurring in the cytoplasm. 
E) have to prevent aerobic respiration in the cytoplasm. 
A) have to prevent cAMP from entering the tracheal cells. 
B) have to prevent pyruvate reduction from occurring. 
C) have to prevent glycolysis from occurring in the mitochondria. 
D) have to prevent glycolysis from occurring in the cytoplasm. 
E) have to prevent aerobic respiration in the cytoplasm.

Question 17

Pyruvate oxidation;carrier of acetyl groups.

Accepted Answer

A) ATP 
B) FAD 
C) G3P 
D) NAD+ 
E) acetyl-CoA 
A) ATP 
B) FAD 
C) G3P 
D) NAD+ 
E) acetyl-CoA

Question 18

The oxygen utilized in cellular respiration finally shows up as

Accepted Answer

A) CO2. 
B) ATP. 
C) new O2. 
D) H2O. 
E) part of a sugar. 
A) CO2. 
B) ATP. 
C) new O2. 
D) H2O. 
E) part of a sugar.

Question 19

When ATP levels are high,oxidative pathways are inhibited,so acetyl-CoA is channeled into

Accepted Answer

A) fatty acid synthesis. 
B) pyruvate formation. 
C) the Krebs cycle. 
D) the electron transport system. 
E) NAD production. 
A) fatty acid synthesis. 
B) pyruvate formation. 
C) the Krebs cycle. 
D) the electron transport system. 
E) NAD production.

Question 20

Chief energy currency of cells;formed by chemiosmosis.

Accepted Answer

A) ATP 
B) FAD 
C) G3P 
D) NAD+ 
E) acetyl-CoA 
A) ATP 
B) FAD 
C) G3P 
D) NAD+ 
E) acetyl-CoA

Exam 7: How Cells Harvest Energy

The amino acids must be first __________ before they can be used in catabolic reactions.

Which of the following molecules does not cross the inner membrane of the mitochondria?

The reaction,C6H6O6 + 6O2 = 6 CO2 + 6 H2O,when it occurs in living cells is known as

Intermediate in glycolysis;finally oxidized to pyruvate.

Which of the following statements about fermentation is false?

The enzymes of the Krebs cycle are located in the

In the absence of oxygen,hydrogen atoms generated by glycolysis are donated to organic molecules in a process called

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C02 molecule.This process is known as ___________.

Since membranes are relatively impermeable to ions,most of the protons re-enter the matrix by passing through special channels in the inner mitochondrial membrane.Because of the inward flow of protons these channels allow the synthesis of

The decarboxylation step of oxidation of pyruvate takes place in the

All of the following are the end products of glycolysis except

The energy released in the mitochondrial electron transport chain is used to transport protons into the

Organisms that can manufacture their own chemical energy sources are called _____________.

Cytochromes are respiratory proteins.Which of the following statements accurately reflects their true nature?

A biochemist wants to control the initial substrate-level phosphorylation that occurs in the tracheal cells of grasshoppers once glucose has crossed the plasma membrane.This means that he will

Pyruvate oxidation;carrier of acetyl groups.

The oxygen utilized in cellular respiration finally shows up as

When ATP levels are high,oxidative pathways are inhibited,so acetyl-CoA is channeled into

Chief energy currency of cells;formed by chemiosmosis.

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The reaction,C₆H₆O₆ + 6O₂ = 6 CO₂ + 6 H₂O,when it occurs in living cells is known as

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C0₂ molecule.This process is known as ___________.