Question 1

Which carbohydrate is present in RNA?

Accepted Answer

A) ribulose 
B) glucose 
C) mannose 
D) ribose 
E) fructose 
A) ribulose 
B) glucose 
C) mannose 
D) ribose 
E) fructose

Question 2

The simplest aldose is named 2,3-dihydroxypropanal,although it is more commonly referred to as glyceraldehyde.What is the structure of glyceraldehyde?

Accepted Answer

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

Question 3

What two monosaccharides join to form the disaccharide lactose?

Accepted Answer

A) glucose and galactose 
B) galactose and fructose 
C) ribose and galactose 
D) glucose and fructose 
E) glucose and glucose 
A) glucose and galactose 
B) galactose and fructose 
C) ribose and galactose 
D) glucose and fructose 
E) glucose and glucose

Question 4

Which of the following statements concerning stereochemistry is INCORRECT?

Accepted Answer

A) Stereoisomers are molecules with the same molecular formula,same bonding pattern,but different spatial arrangement of atoms. 
B) A chiral carbon is a carbon atom that has four different groups bonded to it. 
C) A molecule that contains a chiral carbon is a chiral molecule,and exists as a pair of enantiomers. 
D) Enantiomers are superimposable mirror image stereoisomers. 
E) A racemic mixture of enantiomers is optically inactive. 
A) Stereoisomers are molecules with the same molecular formula,same bonding pattern,but different spatial arrangement of atoms. 
B) A chiral carbon is a carbon atom that has four different groups bonded to it. 
C) A molecule that contains a chiral carbon is a chiral molecule,and exists as a pair of enantiomers. 
D) Enantiomers are superimposable mirror image stereoisomers. 
E) A racemic mixture of enantiomers is optically inactive.

Question 5

What disaccharide is composed of two glucose units joined together?

Accepted Answer

A) lactose 
B) maltose 
C) sucrose 
D) cellulose 
E) galactose 
A) lactose 
B) maltose 
C) sucrose 
D) cellulose 
E) galactose

Question 6

A laboratory sample contains enantiomers present in equal concentrations.Which of the following statements concerning this sample is FALSE?

Accepted Answer

A) The sample contains a racemic mixture. 
B) The sample will be optically inactive. 
C) The sample contains two different compounds related as non-superimposable mirror image isomers. 
D) The sample contains a meso compound. 
A) The sample contains a racemic mixture. 
B) The sample will be optically inactive. 
C) The sample contains two different compounds related as non-superimposable mirror image isomers. 
D) The sample contains a meso compound.

Question 7

The open chain structure of D-fructose is shown.What is the Haworth projection for β-D-fructose?

Accepted Answer

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

Question 8

What is the molecular formula of glucose?

Accepted Answer

A) C6H12O5 
B) C6H12O6 
C) C6H10O5 
D) C5H10O5 
E) C9H18O9 
A) C6H12O5 
B) C6H12O6 
C) C6H10O5 
D) C5H10O5 
E) C9H18O9

Question 9

Which monosaccharide found in the blood has its concentration regulated by the hormones insulin and glucagon?

Accepted Answer

A) fructose 
B) glucose 
C) galactose 
D) ribose 
E) sucrose 
A) fructose 
B) glucose 
C) galactose 
D) ribose 
E) sucrose

Question 10

What polysaccharide found in animals has a structure very similar to amylopectin?

Accepted Answer

A) glucose 
B) glycogen 
C) starch 
D) amylose 
E) cellulose 
A) glucose 
B) glycogen 
C) starch 
D) amylose 
E) cellulose

Question 11

The Fischer projections of two monosaccharides are shown below.What is the relationship between the two monosaccharides?

Accepted Answer

A) enantiomers 
B) diastereomers 
C) structural isomers 
D) meso isomers 
E) cis-trans isomers 
A) enantiomers 
B) diastereomers 
C) structural isomers 
D) meso isomers 
E) cis-trans isomers

Question 12

Which enantiomer of glyceraldehyde is represented in the following structure?

Accepted Answer

A) trans 
B) α 
C) β 
D) D 
E) L 
A) trans 
B) α 
C) β 
D) D 
E) L

Question 13

Humans can digest glucose polymers containing α(1→4)glycosidic linkages,but not those with β(1→4)linkages.

Accepted Answer

A) True 
 B)False

Question 14

Disaccharides and polysaccharides contain monosaccharide units joined together by which of the following?

Accepted Answer

A) dipole/dipole forces 
B) hydrogen bonding 
C) hemiacetal bonds 
D) glycosidic linkages 
E) peptide bonds 
A) dipole/dipole forces 
B) hydrogen bonding 
C) hemiacetal bonds 
D) glycosidic linkages 
E) peptide bonds

Question 15

Which of the following correctly matches the term with its definition?

Accepted Answer

A) ketose - monosaccharide with a ketone functional group 
B) aldose - monosaccharide with a carbonyl group on the end carbon 
C) tetrose - a four carbon sugar 
D) pentose - a five carbon sugar 
E) All of the choices are correct. 
A) ketose - monosaccharide with a ketone functional group 
B) aldose - monosaccharide with a carbonyl group on the end carbon 
C) tetrose - a four carbon sugar 
D) pentose - a five carbon sugar 
E) All of the choices are correct.

Question 16

The structure of ribose,found in RNA,is shown below.How does the structure of deoxyribose,found in DNA,compare to it?

Accepted Answer

A) Deoxyribose has one less oxygen. 
B) Deoxyribose has one more oxygen. 
C) Deoxyribose has one less oxygen and one less hydrogen. 
D) Deoxyribose has one less hydrogen. 
E) Deoxyribose has one less oxygen and two less hydrogens. 
A) Deoxyribose has one less oxygen. 
B) Deoxyribose has one more oxygen. 
C) Deoxyribose has one less oxygen and one less hydrogen. 
D) Deoxyribose has one less hydrogen. 
E) Deoxyribose has one less oxygen and two less hydrogens.

Question 17

What product is formed when the monosaccharide below is oxidized by a basic solution of Benedict's reagent?

Accepted Answer

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

Question 18

Which of the following carbohydrates is also known as dextrose,and is the sugar referred to when blood sugar is measured?

Accepted Answer

A) glycogen 
B) sucrose 
C) glucose 
D) starch 
E) lactose 
A) glycogen 
B) sucrose 
C) glucose 
D) starch 
E) lactose

Question 19

The principal carbohydrate in milk is galactose.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following is NOT a common name for D-glucose?

Accepted Answer

A) table sugar 
B) dextrose 
C) grape sugar 
D) blood sugar 
E) All of the choices are correct. 
A) table sugar 
B) dextrose 
C) grape sugar 
D) blood sugar 
E) All of the choices are correct.

Exam 16: Carbohydrates

Which carbohydrate is present in RNA?

The simplest aldose is named 2,3-dihydroxypropanal,although it is more commonly referred to as glyceraldehyde.What is the structure of glyceraldehyde?

What two monosaccharides join to form the disaccharide lactose?

Which of the following statements concerning stereochemistry is INCORRECT?

What disaccharide is composed of two glucose units joined together?

A laboratory sample contains enantiomers present in equal concentrations.Which of the following statements concerning this sample is FALSE?

The open chain structure of D-fructose is shown.What is the Haworth projection for β-D-fructose?

What is the molecular formula of glucose?

Which monosaccharide found in the blood has its concentration regulated by the hormones insulin and glucagon?

What polysaccharide found in animals has a structure very similar to amylopectin?

The Fischer projections of two monosaccharides are shown below.What is the relationship between the two monosaccharides?

Which enantiomer of glyceraldehyde is represented in the following structure?

Humans can digest glucose polymers containing α(1→4)glycosidic linkages,but not those with β(1→4)linkages.

Disaccharides and polysaccharides contain monosaccharide units joined together by which of the following?

Which of the following correctly matches the term with its definition?

The structure of ribose,found in RNA,is shown below.How does the structure of deoxyribose,found in DNA,compare to it?

What product is formed when the monosaccharide below is oxidized by a basic solution of Benedict's reagent?

Which of the following carbohydrates is also known as dextrose,and is the sugar referred to when blood sugar is measured?

The principal carbohydrate in milk is galactose.

Which of the following is NOT a common name for D-glucose?

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

Lipids and Their Functions in Biochemical Systems

Protein Structure and Function

Enzymes

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

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