Carbohydrates

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Question 1
Free
Multiple Choice

A carbohydrate that gives two molecules when it is completely hydrolyzed is known as a ________ .

Choose correct answer/s
A

monosaccharide

B

disaccharide

C

polysaccharide

D

starch

E

trisaccharide

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Question 2
Free
Multiple Choice

Which group of carbohydrates cannot be hydrolyzed to give simpler carbohydrates?

Choose correct answer/s
A

monosaccharides

B

disaccharides

C

trisaccharides

D

tetrasaccharides

E

polysaccharides

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Question 3
Free
Multiple Choice

A monosaccharide that consists of 5 carbon atoms,one of which is in a ketone group,is classified as a(n) ________ .

Choose correct answer/s
A

aldotetrose

B

aldopentose

C

aldohexose

D

ketotetrose

E

ketopentose

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Question 4
Free
Multiple Choice

A monosaccharide that contains 4 carbon atoms,one of which is in an aldehyde group,is classified as a(n) ________ .

Choose correct answer/s
A

aldopentose

B

aldohexose

C

ketopentose

D

aldotetrose

E

ketotetrose

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Question 5
Free
Multiple Choice

A monosaccharide that contains 6 carbon atoms,one of which is in an aldehyde group,is classified as a(n) ________ .

Choose correct answer/s
A

aldopentose

B

aldohexose

C

ketopentose

D

aldotetrose

E

ketotetrose

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Question 6
Multiple Choice

Ribulose has the following structural formula.To what carbohydrate class does ribulose belong? image -OH
C =O

H - C - OH

H - C - OH
image -OH

Choose correct answer/s
A
aldotetrose
B
aldopentose
C
ketotetrose
D
ketopentose
E
ketohexose
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Question 7
Multiple Choice

In the carbon cycle,carbon dioxide and water are converted to glucose and oxygen by ________ .

Choose correct answer/s
A
large animals
B
insects
C
mushrooms
D
green plants
E
earthworms
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Question 8
Multiple Choice

The breakdown of glucose to chemical energy for the cells to do work is an example of ________ .

Choose correct answer/s
A
oxidation
B
respiration
C
reduction
D
anabolism
E
mutarotation
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Question 9
Multiple Choice

Photosynthesis uses ________ as an energy source.

Choose correct answer/s
A
glucose
B
carbon dioxide
C
chlorophyll
D
oxygen
E
sunlight
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Question 10
Multiple Choice

Fructose does not undergo hydrolysis because it is a ________ .

Choose correct answer/s
A
aldose
B
hexose
C
reducing sugar
D
monosaccharide
E
disaccharide
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Question 11
Multiple Choice

Achiral compounds are those which ________ .

Choose correct answer/s
A
have no "handedness"
B
have different mirror images
C
are nonsuperimposable
D
have the same formula but different structures
E
have a carbon attached to four different atoms
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Question 12
Multiple Choice

Stereoisomers that are nonsuperimposable mirror images of each other are known as ________ .

Choose correct answer/s
A
enantiomers
B
achiral isomers
C
superimposable isomers
D
anomers
E
Fischer projections
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Question 13
Multiple Choice

Which of the following objects is chiral? Assume that each object has no markings or printing.

Choose correct answer/s
A
an pencil
B
a baseball bat
C
a glove
D
a hockey puck
E
a drinking glass
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Question 14
Multiple Choice

Which of the following compounds is chiral?

Choose correct answer/s
A
H ∣
H - C - H

H
B
H ∣
HO - C - OH

H
C
image
HO - C - H

Cl
D
Br ∣
H - C - OH

H
E
Cl ∣
Br - C - Cl

Br
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Question 15
Multiple Choice

An enantiomer is ________ .

Choose correct answer/s
A
a stereoisomer that is not a mirror image of another molecule
B
a stereoisomer whose mirror image cannot be superimposed
C
a diastereoisomer
D
a constitutional isomer
E
a geometric isomer
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Question 16
Multiple Choice

Chirality occurs when stereoisomers have mirror images that are ________ .

Choose correct answer/s
A
superimposable
B
the same
C
not superimposable
D
not visible to one another
E
identical
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Question 17
Multiple Choice

How many different substituents are required on a carbon atom for it to be chiral?

Choose correct answer/s
A
one
B
two
C
three
D
four
E
Any number from 1 to 4; chiralty does not depend on substitution.
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Question 18
Multiple Choice

Chiral drugs consist of only one enantiomer.The benefits of using a pure enantiomer,rather than a mixture,include ________ .

Choose correct answer/s
A
higher potency (lower total dose of drug)
B
elimination of side effects
C
reduced chances of drug interactions
D
all of the above
E
none of the above
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Question 19
Multiple Choice

In the L- isomer of a Fischer projection of a monosaccharide,the -OH group furthest from the carbonyl is written ________ .

Choose correct answer/s
A
on the left of the top chiral carbon
B
on the right of the top chiral carbon
C
on the left of the middle chiral carbon
D
on the left of the bottom chiral carbon
E
on the right of the bottom chiral carbon
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Question 20
Multiple Choice

One difference between D-glucose and L-glucose is ________ .

Choose correct answer/s
A
the open-chain form of L-glucose does not exist
B
it is not possible to make L-glucose
C
L-glucose has a 5-membered ring,and D-glucose has a 6-membered ring
D
only D-glucose can act as a substrate in metabolic reactions
E
L-glucose cannot form a closed structure
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