Question 1

A hemiacetal is a compound that contains a hydroxyl group (-OH)and an alkoxy group (-OR)on adjacent carbon atoms.

Accepted Answer

A) True 
 B)False

Question 2

The structures of galactose (left)and glucose (right)are shown below. How are the two monosaccharides related?

Accepted Answer

A) structural isomers 
B) stereoisomers 
C) enantiomers 
D) anomers 
A) structural isomers 
B) stereoisomers 
C) enantiomers 
D) anomers

Question 3

When the monosaccharide below is oxidized by Benedict's reagent, the indicated product results.

Accepted Answer

A) True 
 B)False

Question 4

What is the difference between the disaccharides lactose and maltose?

Accepted Answer

A) Lactose contains two glucose units, while maltose contains two galactose units. 
B) The two monosaccharides in lactose are joined by a 1$\rightarrow$4-$\beta$-glycoside bond, while the two monosaccharides in maltose are joined by a 1$\rightarrow$4-$\alpha$-glycoside bond. 
C) Lactose contains both an acetal and a hemiacetal, while maltose contains two acetals. 
D) Lactose can be hydrolyzed in the body, but maltose cannot. 
A) Lactose contains two glucose units, while maltose contains two galactose units. 
B) The two monosaccharides in lactose are joined by a 1$\rightarrow$4-$\beta$-glycoside bond, while the two monosaccharides in maltose are joined by a 1$\rightarrow$4-$\alpha$-glycoside bond. 
C) Lactose contains both an acetal and a hemiacetal, while maltose contains two acetals. 
D) Lactose can be hydrolyzed in the body, but maltose cannot.

Question 5

Which compound is the most soluble in water?

Accepted Answer

A) CH2OHCHOHCHOHCHOHCHOHCHO 
B) CH3CH2CH=CHCH2CH=CHCH2CH2CH2CH2CH2CH2CH2COOH 
C) CH3CH2CH2CH2CH2CH2CH2CH2CH3 
D) CH3CH2CH2CH2CH2CH2CH2CH2OH 
A) CH2OHCHOHCHOHCHOHCHOHCHO 
B) CH3CH2CH=CHCH2CH=CHCH2CH2CH2CH2CH2CH2CH2COOH 
C) CH3CH2CH2CH2CH2CH2CH2CH2CH3 
D) CH3CH2CH2CH2CH2CH2CH2CH2OH

Question 6

Humans store glucose for short term energy requirements in the polysaccharide _____.

Accepted Answer

The answer of Humans store glucose for short term energy...

Question 7

The monosaccharide shown below is an $\alpha$ anomer.

Accepted Answer

A) True 
 B)False

Question 8

Cellulose is a highly branched polymer composed of repeating glucose units joined in a 1$\rightarrow$4-$\beta$-glycosidic linkage.

Accepted Answer

A) True 
 B)False

Question 9

Carbohydrates are structurally defined as polyhydroxyaldehydes and polyhydroxyketones, or compounds that can be hydrolyzed to them.

Accepted Answer

A) True 
 B)False

Question 10

What is the polysaccharide form in which glucose is stored in animals?

Accepted Answer

A) cellulose 
B) amylose 
C) amylopectin 
D) glycogen 
A) cellulose 
B) amylose 
C) amylopectin 
D) glycogen

Question 11

The two monosaccharides shown below are related as enantiomers.

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) hydrogen bonding 
B) glycosidic linkages 
C) hemiacetal bonds 
D) dipole-dipole forces 
A) hydrogen bonding 
B) glycosidic linkages 
C) hemiacetal bonds 
D) dipole-dipole forces

Question 13

The conversion of D-ribose to L-ribose is an example of mutarotation.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not a term that would properly describe glucose as it is shown below?

Accepted Answer

A) monosaccharide 
B) aldohexose 
C) reducing sugar 
D) $\beta$-D-glucose 
A) monosaccharide 
B) aldohexose 
C) reducing sugar 
D) $\beta$-D-glucose

Question 15

Hydrolysis of the disaccharide below yields the indicated products.

Accepted Answer

A) True 
 B)False

Question 16

Carbohydrates that are oxidized with Benedict's reagent are called reducing sugars, because they reduce the Cu2+ in Benedict's reagent to Cu+ during the reaction.

Accepted Answer

A) True 
 B)False

Question 17

Carbohydrates are chiral biomolecules. The term chiral indicates that carbohydrates can be both synthesized and digested by the human body.

Accepted Answer

A) True 
 B)False

Question 18

The simplest aldose is commonly called glyceraldehyde, although its IUPAC name is 2, 3-dihydroxypropanal. What is the structure of this compound?

Accepted Answer

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

Question 19

Gentobiose, a rare disaccharide found in saffron, produces two identical monosaccharides when it undergoes hydrolysis. What is the identity of the hydrolysis product?

Accepted Answer

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

Question 20

What monosaccharide is found in cellulose, starch, and glycogen?

Accepted Answer

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

Exam 20: Carbohydrates

A hemiacetal is a compound that contains a hydroxyl group (-OH)and an alkoxy group (-OR)on adjacent carbon atoms.

The structures of galactose (left)and glucose (right)are shown below. How are the two monosaccharides related?

When the monosaccharide below is oxidized by Benedict's reagent, the indicated product results.

What is the difference between the disaccharides lactose and maltose?

Which compound is the most soluble in water?

Humans store glucose for short term energy requirements in the polysaccharide _____.

The monosaccharide shown below is an α\alphaα anomer.

Cellulose is a highly branched polymer composed of repeating glucose units joined in a 1 →\rightarrow→ 4- β\betaβ -glycosidic linkage.

Carbohydrates are structurally defined as polyhydroxyaldehydes and polyhydroxyketones, or compounds that can be hydrolyzed to them.

What is the polysaccharide form in which glucose is stored in animals?

The two monosaccharides shown below are related as enantiomers.

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

The conversion of D-ribose to L-ribose is an example of mutarotation.

Which of the following is not a term that would properly describe glucose as it is shown below?

Hydrolysis of the disaccharide below yields the indicated products.

Carbohydrates that are oxidized with Benedict's reagent are called reducing sugars, because they reduce the Cu2+ in Benedict's reagent to Cu+ during the reaction.

Carbohydrates are chiral biomolecules. The term chiral indicates that carbohydrates can be both synthesized and digested by the human body.

The simplest aldose is commonly called glyceraldehyde, although its IUPAC name is 2, 3-dihydroxypropanal. What is the structure of this compound?

Gentobiose, a rare disaccharide found in saffron, produces two identical monosaccharides when it undergoes hydrolysis. What is the identity of the hydrolysis product?

What monosaccharide is found in cellulose, starch, and glycogen?

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

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

The monosaccharide shown below is an $\alpha$ anomer. $The monosaccharide shown below is an \alpha anomer.$

Cellulose is a highly branched polymer composed of repeating glucose units joined in a 1 $\rightarrow$ 4- $\beta$ -glycosidic linkage.

Carbohydrates that are oxidized with Benedict's reagent are called reducing sugars, because they reduce the Cu²⁺ in Benedict's reagent to Cu⁺ during the reaction.