Chem 221 - Biochemistry for Science Majors » Fall 2021 » L11 Carbohydrates Part 1 of 2

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Question #1
Glucose has three chiral carbons.
A.   FALSE
B.   TRUE
Question #2
In a cyclic structure, when the hydroxyl group of C#1 points up, the anomer is alpha.
A.   TRUE
B.   FALSE
Question #3
Glyceraldehyde forms a six membered ring
A.   FALSE
B.   TRUE
Question #4
Cyclization creates two steroisomers referred as α anomer and β anomer.
A.   TRUE
B.   FALSE
Question #5
Cyclization creates a new asymmetric center at carbon 1.
A.   FALSE
B.   TRUE
Question #6
Which of the following monosaccharides is not an aldose?
A.   Glucose
B.   Fructose
C.   Ribose
D.   Glyceraldehyde
Question #7
The reference compound for naming D and L isomers of sugars is:
A.   ribose
B.   glucose
C.   fructose
D.   glyceraldehyde
E.   sucrose
Question #8
Which of the following pairs is interconverted in the process of mutarotation?
A.   D-glucose and L-glucose
B.   D-glucose and D-fructose
C.   D-glucose and D-glucosamine
D.   alpha-D-glucose and beta-D-glucose
E.   D-glucose and D-galactose
Question #9
Which of the following is not a reducing sugar?
A.   Glucose
B.   Glyceraldehyde
C.   Sucrose
D.   Fructose
Question #10
The general chemical formula of carbohydrate is
A.   (CH2O)n
B.   (CHO)n
C.   CnH2nO
D.   (CH2O)2n
Question #11
Which of the following is an aldotriose?
A.   Dihydroxyacetone
B.   Glyceraldehyde
C.   glucose
D.   fructose
Question #12
A keto pentose will have _____ stereoisomers.
A.   10
B.   6
C.   8
D.   4
Question #13
The only carbohydrate which is not having any chiral carbon atom is
A.   Dihydroxyacetone
B.   fructose
C.   glucose
D.   Glyceraldehyde
Question #14
An aldohexose will have _____ stereoisomers
A.   8
B.   14
C.   16
D.   10
Question #15
Minimum number of carbon required for a monosaccharide
A.   3
B.   2
C.   1
D.   4
Question #16
Pyranoses are five membered rings.
A.   TRUE
B.   FALSE
Question #17
Fructose and glyceraldehyde are aldoses.
A.   FALSE
B.   TRUE
Question #18
The reference carbon in fructose is C#5.
A.   FALSE
B.   TRUE
Question #19
Glucose and fructose are isomers.
A.   TRUE
B.   FALSE
Question #20
The smallest carbohydrate has three oxygen atoms.
A.   FALSE
B.   TRUE
Question #21
Which of the following statement is true?
A.   glucose and fructose are about equally soluble
B.   fructose is much more soluble than glucose
C.   glucose and fructose are equally sweet
D.   glucose is more soluble and fructose
Question #22
Choose the false statement.
A.   glucose is solid at room temperature
B.   glucose is soluble in polar solvents
C.   glucose is soluble in nonpolar solvents
D.   fructose is insoluble in non polar solvents
Question #23
Choose the true statement.
A.   glucose is hydrophobic
B.   Carbohydrates are hydrophobic
C.   glyceraldehyde is hydrophilic
D.   saccharides are all soluble in water
Question #24
Carbohydrates may contain nitrogen.
A.   TRUE
B.   FALSE
Question #25
Carbohydrates are monohydroxylated aldehydes or ketones.
A.   TRUE
B.   FALSE
Question #26
Carbohydrates are molecules that contain an aldehyde or a ketone group, and every carbon other than the carbonyl carbon has a hydroxyl group attached to it.
A.   FALSE
B.   TRUE
Question #27
The smallest carbohydrate has four carbon atoms.
A.   FALSE
B.   TRUE
Question #28
All monosaccharides are water soluble.
A.   TRUE
B.   FALSE
Question #29
In ketoses, the carbonyl carbon is carbon 1.
A.   FALSE
B.   TRUE
Question #30
In aldoses, the carbonyl carbon is carbon 1.
A.   FALSE
B.   TRUE
Question #31
Dihydroxyacetone is a aldotriose.
A.   TRUE
B.   FALSE
Question #32
Fructose has three chiral carbons.
A.   FALSE
B.   TRUE
Question #33
Dihydroxyacetone and glyceraldehyde are isomers.
A.   TRUE
B.   FALSE
Question #34
glucose and glyceraldehyde are isomers.
A.   FALSE
B.   TRUE
Question #35
The reference carbon in glucose is C#1.
A.   FALSE
B.   TRUE

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