Question 1

Acetyl CoA contains an acetyl group bonded to coenzyme A by a thioester bond.

Accepted Answer

A) True 
 B)False

Question 2

The product of the catabolic pathways is different for proteins, triacylglycerols, and carbohydrates.

Accepted Answer

A) True 
 B)False

Question 3

Which is the sum of all of the chemical reactions that take place in an organism?

Accepted Answer

A) anabolism 
B) metabolism 
C) catabolism 
D) citric acid cycle 
A) anabolism 
B) metabolism 
C) catabolism 
D) citric acid cycle

Question 4

NAD+ is the abbreviation for nicotinamide adenine dinucleotide.

Accepted Answer

A) True 
 B)False

Question 5

Which is the primary energy-carrying molecule in metabolic pathways?

Accepted Answer

A) AMP 
B) ATP 
C) NADH 
D) Acetyl CoA 
E) FADH2 
A) AMP 
B) ATP 
C) NADH 
D) Acetyl CoA 
E) FADH2

Question 6

The citric acid cycle is also called the tricarboxylic acid cycle (TCA cycle).

Accepted Answer

A) True 
 B)False

Question 7

Protein digestion begins in the _____.

Accepted Answer

The answer of Protein digestion begins in the _____....

Question 8

H+ ions generated by reactions in the electron transport chain, as well as H+ ions present in the matrix of the mitochondria, are pumped across the inner mitochondrial membrane into the intermembrane space at three different sites.

Accepted Answer

A) True 
 B)False

Question 9

The hydrolysis of ATP is an energy-requiring reaction that cleaves one phosphate group, forming ADP and hydrogen phosphate, (HPO42-).

Accepted Answer

A) True 
 B)False

Question 10

The electron transport chain is a multistep process that relies on five enzyme systems as well as mobile electron carriers.

Accepted Answer

A) True 
 B)False

Question 11

The rate of the citric acid cycle depends on the body's need for energy. When energy demands are low and NADH concentration is high, the cycle is inhibited.

Accepted Answer

A) True 
 B)False

Question 12

Stage [3] of catabolism is sometimes called aerobic respiration.

Accepted Answer

A) True 
 B)False

Question 13

Considering the energy changes associated with the two individual reactions below, what is the energy change associated with the energetically favorable coupled reaction?

Accepted Answer

A) - 11.2 kcal/mol 
B) - 3.4 kcal/mol 
C) - 7.3 kcal/mol 
D) + 3.4 kcal/mol 
E) + 11.2 kcal/mol 
A) - 11.2 kcal/mol 
B) - 3.4 kcal/mol 
C) - 7.3 kcal/mol 
D) + 3.4 kcal/mol 
E) + 11.2 kcal/mol

Question 14

Which is not true about coenzymes?

Accepted Answer

A) Many reactions in metabolic pathways involve coenzymes. 
B) When a coenzyme gains hydrogen atoms the coenzyme is an oxidizing agent. 
C) Many coenzymes are involved in oxidation and reduction reactions. 
D) The coenzyme nicotinamide adenine dinucleotide, NAD+, is a common biological reducing agent. 
A) Many reactions in metabolic pathways involve coenzymes. 
B) When a coenzyme gains hydrogen atoms the coenzyme is an oxidizing agent. 
C) Many coenzymes are involved in oxidation and reduction reactions. 
D) The coenzyme nicotinamide adenine dinucleotide, NAD+, is a common biological reducing agent.

Question 15

If the phosphorylation of GMP to form GDP requires 7.3 kcal/mol of energy, what is the energy change associated with the hydrolysis of GDP to form GMP?

Accepted Answer

A) 7.3 kcal/mol 
B) -7.3 kcal/mol 
C) 14.6 kcal/mol 
D) Not enough information is given to determine the change in energy. 
A) 7.3 kcal/mol 
B) -7.3 kcal/mol 
C) 14.6 kcal/mol 
D) Not enough information is given to determine the change in energy.

Question 16

Which molecule contains the largest amount of stored energy?

Accepted Answer

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

Question 17

Considering the energy changes associated with the two individual reactions below, what coupled reaction is an energetically favorable one?

Accepted Answer

A) fructose 1, 6-bisphosphate + H2O   fructose 6-phosphate + HPO42- 
B) ADP + fructose 1, 6-bisphosphate   ATP + fructose 6-phosphate 
C) ATP + H2O   ADP + HPO42- 
D) ADP + fructose 6-phosphate   ATP + fructose 1, 6-bisphosphate 
E) ATP + fructose 6-phosphate   ADP + fructose 1, 6-bisphosphate 
A) fructose 1, 6-bisphosphate + H2O   fructose 6-phosphate + HPO42- 
B) ADP + fructose 1, 6-bisphosphate   ATP + fructose 6-phosphate 
C) ATP + H2O   ADP + HPO42- 
D) ADP + fructose 6-phosphate   ATP + fructose 1, 6-bisphosphate 
E) ATP + fructose 6-phosphate   ADP + fructose 1, 6-bisphosphate

Question 18

The citric acid cycle comprises stage [4] of metabolism.

Accepted Answer

A) True 
 B)False

Question 19

How many reactions in the citric acid cycle generate FADH2?

Accepted Answer

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

Question 20

Which is the major product of stage [2] of catabolism?

Accepted Answer

A) NADH 
B) acetyl CoA 
C) GTP 
D) CO2 
A) NADH 
B) acetyl CoA 
C) GTP 
D) CO2

Exam 23: Digestion and the Conversion of Food Into Energy

Acetyl CoA contains an acetyl group bonded to coenzyme A by a thioester bond.

The product of the catabolic pathways is different for proteins, triacylglycerols, and carbohydrates.

Which is the sum of all of the chemical reactions that take place in an organism?

NAD+ is the abbreviation for nicotinamide adenine dinucleotide.

Which is the primary energy-carrying molecule in metabolic pathways?

The citric acid cycle is also called the tricarboxylic acid cycle (TCA cycle).

Protein digestion begins in the _____.

H+ ions generated by reactions in the electron transport chain, as well as H+ ions present in the matrix of the mitochondria, are pumped across the inner mitochondrial membrane into the intermembrane space at three different sites.

The hydrolysis of ATP is an energy-requiring reaction that cleaves one phosphate group, forming ADP and hydrogen phosphate, (HPO42-).

The electron transport chain is a multistep process that relies on five enzyme systems as well as mobile electron carriers.

The rate of the citric acid cycle depends on the body's need for energy. When energy demands are low and NADH concentration is high, the cycle is inhibited.

Stage [3] of catabolism is sometimes called aerobic respiration.

Considering the energy changes associated with the two individual reactions below, what is the energy change associated with the energetically favorable coupled reaction?

Which is not true about coenzymes?

If the phosphorylation of GMP to form GDP requires 7.3 kcal/mol of energy, what is the energy change associated with the hydrolysis of GDP to form GMP?

Which molecule contains the largest amount of stored energy?

Considering the energy changes associated with the two individual reactions below, what coupled reaction is an energetically favorable one?

The citric acid cycle comprises stage [4] of metabolism.

How many reactions in the citric acid cycle generate FADH2?

Which is the major product of stage [2] of catabolism?

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

NAD⁺is the abbreviation for nicotinamide adenine dinucleotide.

H⁺ ions generated by reactions in the electron transport chain, as well as H⁺ ions present in the matrix of the mitochondria, are pumped across the inner mitochondrial membrane into the intermembrane space at three different sites.

The hydrolysis of ATP is an energy-requiring reaction that cleaves one phosphate group, forming ADP and hydrogen phosphate, (HPO₄^2-).

How many reactions in the citric acid cycle generate FADH₂?