Question 1

Which of the following groups are expected to be found in carbohydrates?

Accepted Answer

A)  alcohol 
B)  thiol 
C)  methyl 
D)  amide 
A)  alcohol 
B)  thiol 
C)  methyl 
D)  amide A

Question 2

Carbohydrates which contain two sugar units chemically linked together are called a(n)_____ .

Accepted Answer

A)  monosaccharides 
B)  disaccharides 
C)  trisaccharides 
D)  polysaccharides 
A)  monosaccharides 
B)  disaccharides 
C)  trisaccharides 
D)  polysaccharides B

Question 3

Which polysaccharide usually makes up 80-90% of plant starch?

Accepted Answer

A)  chitin 
B)  amylopectin 
C)  heparin 
D)  hyaluronic acid 
A)  chitin 
B)  amylopectin 
C)  heparin 
D)  hyaluronic acid B

Question 4

How many chiral carbons are contained in ribose,which is shown below?

Accepted Answer

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

Question 5

Which form of monosaccharides is preferred by human cells?

Accepted Answer

A)  D 
B)  L 
C)  both 
D)  neither 
A)  D 
B)  L 
C)  both 
D)  neither

Question 6

Which of the following statements about chiral carbons is correct?

Accepted Answer

A)  A chiral carbon is one that has four different groups attached. 
B)  A chiral carbon is one that determines the possibility of stereoisomerism. 
C)  A chiral carbon can be an interior carbon. 
D)  There is more than one correct response. 
A)  A chiral carbon is one that has four different groups attached. 
B)  A chiral carbon is one that determines the possibility of stereoisomerism. 
C)  A chiral carbon can be an interior carbon. 
D)  There is more than one correct response.

Question 7

The structure given below has what type of glycosidic linkage?

Accepted Answer

A)  ($\alpha$(1$\rarr$6) 
B)  ($\beta$(1$\rarr$4) 
C)  ($\beta$(1$\rarr$6) 
D)  ($\alpha$(1$\rarr$4) 
A)  ($\alpha$(1$\rarr$6) 
B)  ($\beta$(1$\rarr$4) 
C)  ($\beta$(1$\rarr$6) 
D)  ($\alpha$(1$\rarr$4)

Question 8

Glyceraldehyde is the simplest member of the carbohydrates and is shown below.What is the total number of functional groups that this molecule contain?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
A)  0 
B)  1 
C)  2 
D)  3

Question 9

Which is a test for the presence of starch?

Accepted Answer

A)  Benedict's test 
B)  exposure to iodine 
C)  sweet taste 
D)  acid-base titration 
A)  Benedict's test 
B)  exposure to iodine 
C)  sweet taste 
D)  acid-base titration

Question 10

A short description of a stereoisomer would be?

Accepted Answer

A)  Stereoisomers are all of the isomers for compounds that can have in excess of two isomers. 
B)  Stereoisomers are those compounds that can have two isomers that are straight chain and the right side is different from the left side. 
C)  Stereoisomers are two isomers that resemble each other in the sense that one of the isomers is the mirror image of the other. 
D)  There is more than one correct response. 
A)  Stereoisomers are all of the isomers for compounds that can have in excess of two isomers. 
B)  Stereoisomers are those compounds that can have two isomers that are straight chain and the right side is different from the left side. 
C)  Stereoisomers are two isomers that resemble each other in the sense that one of the isomers is the mirror image of the other. 
D)  There is more than one correct response.

Question 11

A component of lactose is the sugar _____ .

Accepted Answer

A)  ribose 
B)  deoxyribose 
C)  fructose 
D)  galactose 
A)  ribose 
B)  deoxyribose 
C)  fructose 
D)  galactose

Question 12

The structure given below has what type of glycosidic linkage?

Accepted Answer

A)  ($\alpha$(1$\rarr$6) 
B)  ($\beta$(1$\rarr$4) 
C)  ($\beta$(1$\rarr$6) 
D)  ($\alpha$(1$\rarr$4) 
A)  ($\alpha$(1$\rarr$6) 
B)  ($\beta$(1$\rarr$4) 
C)  ($\beta$(1$\rarr$6) 
D)  ($\alpha$(1$\rarr$4)

Question 13

One function of carbohydrates is to form structural elements of some cells and tissues.

Accepted Answer

A) True 
 B)False

Question 14

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 15

Molecules that are mirror images are enantiomers.

Accepted Answer

A) True 
 B)False

Question 16

Which carbon atoms in the following structure are correctly called chiral carbon atoms?

Accepted Answer

A)  carbons 1 and 2 
B)  carbons 2 and 3 
C)  carbons 3 and 4 
D)  carbons,1,2,3,and 5 
A)  carbons 1 and 2 
B)  carbons 2 and 3 
C)  carbons 3 and 4 
D)  carbons,1,2,3,and 5

Question 17

The following two monosaccharides form a disaccharide by forming a bond between the two carbons indicated with an asterisk (*).What type of linkage results?

Accepted Answer

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

Question 18

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 19

The disaccharide formed during the digestion of starch is _____ .

Accepted Answer

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

Question 20

The carbohydrate below may be classified as a(n)________.

Accepted Answer

A)  aldopentose 
B)  aldohexose 
C)  ketopentose 
D)  ketohexose 
A)  aldopentose 
B)  aldohexose 
C)  ketopentose 
D)  ketohexose

Exam 17: Carbohydrates

Which of the following groups are expected to be found in carbohydrates?

Carbohydrates which contain two sugar units chemically linked together are called a(n)_____ .

Which polysaccharide usually makes up 80-90% of plant starch?

How many chiral carbons are contained in ribose,which is shown below?

Which form of monosaccharides is preferred by human cells?

Which of the following statements about chiral carbons is correct?

The structure given below has what type of glycosidic linkage?

Glyceraldehyde is the simplest member of the carbohydrates and is shown below.What is the total number of functional groups that this molecule contain?

Which is a test for the presence of starch?

A short description of a stereoisomer would be?

A component of lactose is the sugar _____ .

The structure given below has what type of glycosidic linkage?

One function of carbohydrates is to form structural elements of some cells and tissues.

The following structure is best represented as

Molecules that are mirror images are enantiomers.

Which carbon atoms in the following structure are correctly called chiral carbon atoms?

The following two monosaccharides form a disaccharide by forming a bond between the two carbons indicated with an asterisk (*).What type of linkage results?

What is the major difference between glucose and sorbitol?

The disaccharide formed during the digestion of starch is _____ .

The carbohydrate below may be classified as a(n)________.

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