Question 1

Which organ is the main site of gluconeogenesis?

Accepted Answer

A) gall bladder 
B) pancreas 
C) small intestine 
D) stomach 
E) liver 
A) gall bladder 
B) pancreas 
C) small intestine 
D) stomach 
E) liver

Question 2

Glycogenesis occurs under which of the following conditions?

Accepted Answer

A) when digestion of polysaccharides provides high levels of blood glucose 
B) when blood glucose levels are low 
C) when blood glucose is completely depleted due to strenuous exercise 
D) when epinephrine is released from the adrenal glands 
E) when glucose is needed for energy by the brain and muscles 
A) when digestion of polysaccharides provides high levels of blood glucose 
B) when blood glucose levels are low 
C) when blood glucose is completely depleted due to strenuous exercise 
D) when epinephrine is released from the adrenal glands 
E) when glucose is needed for energy by the brain and muscles

Question 3

At the end of glycolysis,how many pyruvate molecules have been produced from 10 glucose molecules?

Accepted Answer

A) 20 
B) 60 
C) 120 
D) 140 
E) 360 
A) 20 
B) 60 
C) 120 
D) 140 
E) 360

Question 4

The end product of glycolysis is pyruvate.What condition inside the cell is needed to convert pyruvate to acetyl CoA for entry into the citric acid cycle?

Accepted Answer

A) sufficient oxygen 
B) anaerobic conditions 
C) yeast 
D) high CO2  
E) All of these are correct. 
A) sufficient oxygen 
B) anaerobic conditions 
C) yeast 
D) high CO2  
E) All of these are correct.

Question 5

What is the net yield of ATP molecules per glucose molecule undergoing glycolysis?

Accepted Answer

A) 2 
B) 4 
C) 8 
D) 16 
E) 686 
A) 2 
B) 4 
C) 8 
D) 16 
E) 686

Question 6

When one molecule of glucose undergoes glycolysis followed by alcohol fermentation,what products,and how many molecules of each of them,account for the 6 carbon atoms?

Accepted Answer

A) 6 molecules of carbon dioxide and 6 molecules of water 
B) 2 molecules of ethanol and 2 molecules of carbon dioxide 
C) 1 molecule of ethanol,3 molecules of carbon dioxide,and 3 molecules of water 
D) 6 molecules of carbon monoxide and 6 molecules of water 
E) None of the choices are correct. 
A) 6 molecules of carbon dioxide and 6 molecules of water 
B) 2 molecules of ethanol and 2 molecules of carbon dioxide 
C) 1 molecule of ethanol,3 molecules of carbon dioxide,and 3 molecules of water 
D) 6 molecules of carbon monoxide and 6 molecules of water 
E) None of the choices are correct.

Question 7

What is the identity of the missing product in the kinase catalyzed reaction shown below? 1,3-bisphosphoglycerate + ADP → 3-phosphoglycerate + ?

Accepted Answer

A) PPi 
B) ATP 
C) AMP 
D) A 
E) water 
A) PPi 
B) ATP 
C) AMP 
D) A 
E) water

Question 8

What substrate is converted into fructose-1,6-bisphosphate by the enzyme phosphofructokinase?

Accepted Answer

A) fructose 
B) fructose-6-phosphate 
C) glucose-6-phosphate 
D) glucose-1,6-bisphosphate 
E) fructose triphosphate 
A) fructose 
B) fructose-6-phosphate 
C) glucose-6-phosphate 
D) glucose-1,6-bisphosphate 
E) fructose triphosphate

Question 9

What hormone is released from the pancreas in response to low blood glucose levels?

Accepted Answer

A) insulin 
B) epinephrine 
C) estrogen 
D) glucagon 
E) testosterone 
A) insulin 
B) epinephrine 
C) estrogen 
D) glucagon 
E) testosterone

Question 10

What substrate is converted into glucose-6-phosphate by the enzyme hexokinase?

Accepted Answer

A) fructose 
B) glycogen 
C) glucose 
D) pyruvate 
E) lactate 
A) fructose 
B) glycogen 
C) glucose 
D) pyruvate 
E) lactate

Question 11

In what stage of catabolism is the most ATP produced?

Accepted Answer

A) Stage I 
B) Stage II 
C) Stage III 
D) It depends on the type of food ingested. 
E) All stages produce an equal amount of ATP. 
A) Stage I 
B) Stage II 
C) Stage III 
D) It depends on the type of food ingested. 
E) All stages produce an equal amount of ATP.

Question 12

Digestion of carbohydrates begins in the mouth with the aid of what enzyme?

Accepted Answer

A) glucase 
B) pepsin 
C) ATP 
D) amylase 
E) NAD+ 
A) glucase 
B) pepsin 
C) ATP 
D) amylase 
E) NAD+

Question 13

In the Cori Cycle,lactate produced in muscles is transported to the liver where it is converted to glucose and returned to the muscles.

Accepted Answer

A) True 
 B)False

Question 14

Which pathway is believed to be the first successful pathway for harvesting energy to have evolved on Earth?

Accepted Answer

A) glycogenesis 
B) Krebs Cycle 
C) glycolysis 
D) pentose phosphate pathway 
E) lactate fermentation 
A) glycogenesis 
B) Krebs Cycle 
C) glycolysis 
D) pentose phosphate pathway 
E) lactate fermentation

Question 15

What key reducing agent is formed in the pentose phosphate pathway for glucose oxidation?

Accepted Answer

A) ATP 
B) NAD+ 
C) NADH 
D) NADP+ 
E) NADPH 
A) ATP 
B) NAD+ 
C) NADH 
D) NADP+ 
E) NADPH

Question 16

Of the several high-energy compounds produced in cells,which one is the principal energy storage compound?

Accepted Answer

A) ATP 
B) AMP 
C) glucose-6-phosphate 
D) glycerol 
E) glucose 
A) ATP 
B) AMP 
C) glucose-6-phosphate 
D) glycerol 
E) glucose

Question 17

Which of the following is a true statement concerning breaking the phosphoanhydride bond of ATP to form ADP?

Accepted Answer

A) Energy is released,which can drive biological processes. 
B) Water is formed because the breaking of the bond is a hydrolysis process. 
C) It is an endothermic process because of the formation of glucose-6-phosphate. 
D) Energy is stored. 
E) Hundreds of kJ/mol are released in the form of heat. 
A) Energy is released,which can drive biological processes. 
B) Water is formed because the breaking of the bond is a hydrolysis process. 
C) It is an endothermic process because of the formation of glucose-6-phosphate. 
D) Energy is stored. 
E) Hundreds of kJ/mol are released in the form of heat.

Question 18

Which pathway is NOT correctly identified as anabolic or catabolic?

Accepted Answer

A) The digestion of starch is a catabolic process. 
B) The synthesis of proteins from amino acids is an anabolic process. 
C) The oxidation of glucose to CO2 and H2O is a catabolic process. 
D) The formation of ADP from ATP is an anabolic process. 
E) The conversion of glycogen to glucose is a catabolic process. 
A) The digestion of starch is a catabolic process. 
B) The synthesis of proteins from amino acids is an anabolic process. 
C) The oxidation of glucose to CO2 and H2O is a catabolic process. 
D) The formation of ADP from ATP is an anabolic process. 
E) The conversion of glycogen to glucose is a catabolic process.

Question 19

The formation of glucose-6-phosphate from glucose in a liver cell effectively traps the glucose within the cell.

Accepted Answer

A) True 
 B)False

Question 20

How many NADH are produced for each glucose molecule that enters glycolysis?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
E) 8 
A) 1 
B) 2 
C) 4 
D) 6 
E) 8

Exam 21: Carbohydrate Metabolism

Which organ is the main site of gluconeogenesis?

Glycogenesis occurs under which of the following conditions?

At the end of glycolysis,how many pyruvate molecules have been produced from 10 glucose molecules?

The end product of glycolysis is pyruvate.What condition inside the cell is needed to convert pyruvate to acetyl CoA for entry into the citric acid cycle?

What is the net yield of ATP molecules per glucose molecule undergoing glycolysis?

When one molecule of glucose undergoes glycolysis followed by alcohol fermentation,what products,and how many molecules of each of them,account for the 6 carbon atoms?

What is the identity of the missing product in the kinase catalyzed reaction shown below? 1,3-bisphosphoglycerate + ADP → 3-phosphoglycerate + ?

What substrate is converted into fructose-1,6-bisphosphate by the enzyme phosphofructokinase?

What hormone is released from the pancreas in response to low blood glucose levels?

What substrate is converted into glucose-6-phosphate by the enzyme hexokinase?

In what stage of catabolism is the most ATP produced?

Digestion of carbohydrates begins in the mouth with the aid of what enzyme?

In the Cori Cycle,lactate produced in muscles is transported to the liver where it is converted to glucose and returned to the muscles.

Which pathway is believed to be the first successful pathway for harvesting energy to have evolved on Earth?

What key reducing agent is formed in the pentose phosphate pathway for glucose oxidation?

Of the several high-energy compounds produced in cells,which one is the principal energy storage compound?

Which of the following is a true statement concerning breaking the phosphoanhydride bond of ATP to form ADP?

Which pathway is NOT correctly identified as anabolic or catabolic?

The formation of glucose-6-phosphate from glucose in a liver cell effectively traps the glucose within the cell.

How many NADH are produced for each glucose molecule that enters glycolysis?

Chemistry - Methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

Calculations, chemical Changes, and the Chemical Equation

States of Matter: Gases, liquids, and Solids

Solutions

Energy,rate and Equilibrium

Acids and Bases

The Nucleus, radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry

The Unsaturated Hydrocarbons: Alkenes, alkynes, and Aromatics

Alcohols, phenols, thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Protein Structure and Function

Enzymes

Introduction to Molecular Genetics

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

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