Question 1

Which of the following sugars fails to give a positive Benedict's test?

Accepted Answer

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

Question 2

How many chiral carbons are contained in the following structure?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 3

What is the name of the following sugar?

Accepted Answer

A) sucrose 
B) maltose 
C) lactose 
D) xylobiose 
A) sucrose 
B) maltose 
C) lactose 
D) xylobiose

Question 4

One can expect that a D enantiomer will rotate polarized light to the right (+ direction).

Accepted Answer

A) True 
 B)False

Question 5

The following structure is best represented as

Accepted Answer

A) pyranose with a beta hydroxy group. 
B) pyranose with an alpha hydroxy group. 
C) furanose with a beta hydroxy group. 
D) furanose with an alpha hydroxy group. 
A) pyranose with a beta hydroxy group. 
B) pyranose with an alpha hydroxy group. 
C) furanose with a beta hydroxy group. 
D) furanose with an alpha hydroxy group.

Question 6

The structure shown below is a β anomer.

Accepted Answer

A) True 
 B)False

Question 7

The body stores carbohydrates as _____ .

Accepted Answer

A) cellulose 
B) glycogen 
C) sucrose 
D) starch 
A) cellulose 
B) glycogen 
C) sucrose 
D) starch

Question 8

All sugars are ketoses.

Accepted Answer

A) True 
 B)False

Question 9

All aldopentoses have 5 carbon atoms.

Accepted Answer

A) True 
 B)False

Question 10

Maltose upon hydrolysis yields

Accepted Answer

A) glucose and galactose. 
B) glucose and fructose. 
C) only glucose. 
D) Hydrolysis does not occur 
A) glucose and galactose. 
B) glucose and fructose. 
C) only glucose. 
D) Hydrolysis does not occur

Question 11

How many stereoisomers of an aldopentose exist?

Accepted Answer

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

Question 12

What is the major difference between glucose and sorbitol?

Accepted Answer

A) Glucose has 6 carbons; sorbitol has 5 carbons. 
B) Glucose has 6 carbons; sorbitol has 7 carbons. 
C) Glucose contains hydroxy groups; sorbitol does not contain hydroxy groups. 
D) Glucose contains an aldehyde carbon; sorbitol has an alcohol carbon in that location. 
A) Glucose has 6 carbons; sorbitol has 5 carbons. 
B) Glucose has 6 carbons; sorbitol has 7 carbons. 
C) Glucose contains hydroxy groups; sorbitol does not contain hydroxy groups. 
D) Glucose contains an aldehyde carbon; sorbitol has an alcohol carbon in that location.

Question 13

A sugar present in honey in a 1:1 ratio with glucose is _____ .

Accepted Answer

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

Question 14

The cyclic form of glucose has how many possible stereoisomers compared to the noncyclic form?

Accepted Answer

A) double 
B) triple 
C) reduced by half 
D) remains the same 
A) double 
B) triple 
C) reduced by half 
D) remains the same

Question 15

What characteristic of carbohydrates is not commonly found in the previously studied classes of compounds?

Accepted Answer

A) Carbohydrates are unique in that they do not contain any nitrogen. 
B) Carbohydrates often contain a functional group on each carbon. 
C) The carbohydrate class is the only class composed solely of cyclic compounds. 
D) There is more than one correct response. 
A) Carbohydrates are unique in that they do not contain any nitrogen. 
B) Carbohydrates often contain a functional group on each carbon. 
C) The carbohydrate class is the only class composed solely of cyclic compounds. 
D) There is more than one correct response.

Question 16

The L form of a stereoisomer has an -OH on the left in the Fischer projection.

Accepted Answer

A) True 
 B)False

Question 17

When the compound below  is treated with Benedict's reagent, that is the product of the reaction?

Accepted Answer

A)    
B)    
C)    
D) no reaction 
A)    
B)    
C)    
D) no reaction

Question 18

​ Which of the following is true about enantiomers?

Accepted Answer

A) They have different structural formulas. 
B) Two enantiomers have different molecular formulas. 
C) They have different spatial arrangements of their atoms. 
D) One enantiomer can be converted into the other by rotation. 
A) They have different structural formulas. 
B) Two enantiomers have different molecular formulas. 
C) They have different spatial arrangements of their atoms. 
D) One enantiomer can be converted into the other by rotation.

Question 19

Many commercials sell fiber supplements but you do not have the money to buy them.  Which of the following is a poor source of fiber?

Accepted Answer

A) steak 
B) beans 
C) carrots 
D) banana 
A) steak 
B) beans 
C) carrots 
D) banana

Question 20

Potatoes, being high in carbohydrates and low in other nutrients, should only be consumed in very small quantities.

Accepted Answer

A) True 
 B)False

Exam 17: Carbohydrates

Which of the following sugars fails to give a positive Benedict's test?

How many chiral carbons are contained in the following structure?

What is the name of the following sugar?

One can expect that a D enantiomer will rotate polarized light to the right (+ direction).

The following structure is best represented as

The structure shown below is a β anomer.

The body stores carbohydrates as _____ .

All sugars are ketoses.

All aldopentoses have 5 carbon atoms.

Maltose upon hydrolysis yields

How many stereoisomers of an aldopentose exist?

What is the major difference between glucose and sorbitol?

A sugar present in honey in a 1:1 ratio with glucose is _____ .

The cyclic form of glucose has how many possible stereoisomers compared to the noncyclic form?

What characteristic of carbohydrates is not commonly found in the previously studied classes of compounds?

The L form of a stereoisomer has an -OH on the left in the Fischer projection.

When the compound below is treated with Benedict's reagent, that is the product of the reaction?

​ Which of the following is true about enantiomers?

Many commercials sell fiber supplements but you do not have the money to buy them. Which of the following is a poor source of fiber?

Potatoes, being high in carbohydrates and low in other nutrients, should only be consumed in very small quantities.

Matter, Measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

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Reaction Rates and Equilibrium

Acids, Bases, and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Lipids

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Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

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Which of the following is true about enantiomers?