Question 1

In which region of a mitochondrion would the pH be lower?

Accepted Answer

A) the matrix 
B) the intermembrane space 
C) the inner mitochondrial membrane 
D) all regions of a mitochondrion have the same pH 
A) the matrix 
B) the intermembrane space 
C) the inner mitochondrial membrane 
D) all regions of a mitochondrion have the same pH

Question 2

Where does energy production occur in animal cells?

Accepted Answer

A) cell membrane 
B) cytoplasm 
C) mitochondria 
D) nucleus 
A) cell membrane 
B) cytoplasm 
C) mitochondria 
D) nucleus

Question 3

Energy released from H+ movement in the electron transport chain fuels the phosphorylation of ADP.

Accepted Answer

A) True 
 B)False

Question 4

Step 7 of the citric acid cycle is shown. Which statement best describes what occurs in this step?

Accepted Answer

A) Fumarate undergoes hydrolysis with the aid of the enzyme fumarase. 
B) Fumarate undergoes reduction with the aid of the cofactor fumarase. 
C) Fumarate undergoes hydrogenation with hydrogens and electrons provided by the enzyme fumarase. 
D) Fumarate undergoes hydration with the aid of the enzyme fumarase. 
A) Fumarate undergoes hydrolysis with the aid of the enzyme fumarase. 
B) Fumarate undergoes reduction with the aid of the cofactor fumarase. 
C) Fumarate undergoes hydrogenation with hydrogens and electrons provided by the enzyme fumarase. 
D) Fumarate undergoes hydration with the aid of the enzyme fumarase.

Question 5

The reduced coenzymes formed in the citric acid cycle enter the _____.

Accepted Answer

electron t

Question 6

How many molecules of reduced coenzymes are produced for each turn of the citric acid cycle?

Accepted Answer

A) 2 
B) 4 
C) 16 
D) 32 
A) 2 
B) 4 
C) 16 
D) 32

Question 7

In which stage of metabolism are biomolecules degraded into two-carbon acetyl units?

Accepted Answer

A) Stage [1] 
B) Stage [2] 
C) Stage [3] 
D) Stage [4] 
A) Stage [1] 
B) Stage [2] 
C) Stage [3] 
D) Stage [4]

Question 8

_____ is a cyclic metabolic pathway that begins with the addition of acetyl CoA to a four-carbon substrate and ends when the same four-carbon compound is formed as a product eight steps later.

Accepted Answer

The citric

Question 9

Where does the hydrolysis of carbohydrates to monosaccharides begin?

Accepted Answer

A) in the stomach 
B) in the saliva 
C) in the liver 
D) in the small intestines 
A) in the stomach 
B) in the saliva 
C) in the liver 
D) in the small intestines

Question 10

How many reactions in the citric acid cycle generate NAD+?

Accepted Answer

A) 0 
B) 1 
C) 3 
D) 8 
A) 0 
B) 1 
C) 3 
D) 8

Question 11

The phosphorylation of glucose provides enough energy for the hydrolysis of ATP.

Accepted Answer

A) True 
 B)False

Question 12

The primary function of the electron transport chain and oxidative phosphorylation is to provide electrons for the hydrolysis of ATP.

Accepted Answer

A) True 
 B)False

Question 13

Which is the enzyme that hydrolyzes triacylglycerols?

Accepted Answer

A) acetyl CoA 
B) protease pepsin 
C) amylase 
D) lipase 
A) acetyl CoA 
B) protease pepsin 
C) amylase 
D) lipase

Question 14

Which best describes the function of the coenzymes NAD+ and FAD in catabolic pathways?

Accepted Answer

A) competitive inhibitors of the enzymes present in each pathway 
B) non-competitive inhibitors of the enzymes present in each pathway 
C) oxidizing agents that accept electrons and hydrogen ions from molecules undergoing oxidation 
D) transport molecules that carry acetyl units to or from the different stages of metabolism 
A) competitive inhibitors of the enzymes present in each pathway 
B) non-competitive inhibitors of the enzymes present in each pathway 
C) oxidizing agents that accept electrons and hydrogen ions from molecules undergoing oxidation 
D) transport molecules that carry acetyl units to or from the different stages of metabolism

Question 15

The primary function of the electron transport chain and oxidative phosphorylation is which of the following?

Accepted Answer

A) to provide electrons and energy for the phosphorylation of ATP 
B) to synthesize the reduced coenzymes necessary for digestion 
C) to oxidize the reduced coenzymes NADH and FADH2, and provide energy for the synthesis of ATP 
D) to transport electrons from ATP to ADP, and synthesize acetyl CoA molecules 
A) to provide electrons and energy for the phosphorylation of ATP 
B) to synthesize the reduced coenzymes necessary for digestion 
C) to oxidize the reduced coenzymes NADH and FADH2, and provide energy for the synthesis of ATP 
D) to transport electrons from ATP to ADP, and synthesize acetyl CoA molecules

Question 16

The energy produced by the citric acid cycle is stored in the bonds of a nucleoside triphosphate and reduced coenzymes.

Accepted Answer

A) True 
 B)False

Question 17

The cleavage of a protein with chymotrypsin occurs in stage [1] of catabolism.

Accepted Answer

A) True 
 B)False

Question 18

Which functional group is not contained in coenzyme A, whose structure is shown below?

Accepted Answer

A) alcohol 
B) sulfhydryl 
C) phosphoester 
D) amide 
E) aldehyde 
A) alcohol 
B) sulfhydryl 
C) phosphoester 
D) amide 
E) aldehyde

Question 19

Coenzyme A, NADH, and FAD all contain phosphate groups.

Accepted Answer

A) True 
 B)False

Question 20

Which coupled reaction properly indicates the role of the coenzyme as an oxidizing agent?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Exam 23: Digestion and the Conversion of Food Into Energy

In which region of a mitochondrion would the pH be lower?

Where does energy production occur in animal cells?

Energy released from H+ movement in the electron transport chain fuels the phosphorylation of ADP.

Step 7 of the citric acid cycle is shown. Which statement best describes what occurs in this step?

The reduced coenzymes formed in the citric acid cycle enter the _____.

How many molecules of reduced coenzymes are produced for each turn of the citric acid cycle?

In which stage of metabolism are biomolecules degraded into two-carbon acetyl units?

_____ is a cyclic metabolic pathway that begins with the addition of acetyl CoA to a four-carbon substrate and ends when the same four-carbon compound is formed as a product eight steps later.

Where does the hydrolysis of carbohydrates to monosaccharides begin?

How many reactions in the citric acid cycle generate NAD+?

The phosphorylation of glucose provides enough energy for the hydrolysis of ATP.

The primary function of the electron transport chain and oxidative phosphorylation is to provide electrons for the hydrolysis of ATP.

Which is the enzyme that hydrolyzes triacylglycerols?

Which best describes the function of the coenzymes NAD+ and FAD in catabolic pathways?

The primary function of the electron transport chain and oxidative phosphorylation is which of the following?

The energy produced by the citric acid cycle is stored in the bonds of a nucleoside triphosphate and reduced coenzymes.

The cleavage of a protein with chymotrypsin occurs in stage [1] of catabolism.

Which functional group is not contained in coenzyme A, whose structure is shown below?

Coenzyme A, NADH, and FAD all contain phosphate groups.

Which coupled reaction properly indicates the role of the coenzyme as an oxidizing agent?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Carbohydrate, Lipid, and Protein Metabolism

Filters

Energy released from H⁺ movement in the electron transport chain fuels the phosphorylation of ADP.

How many reactions in the citric acid cycle generate NAD⁺?

Which best describes the function of the coenzymes NAD⁺ and FAD in catabolic pathways?