CHM 112
GAGE
SPRING 2002
NAME ______________________________
DATE__________________________
EXAM 4
Multiple Choice:
_____ 1.
select the best response for each statement or question.
Which of the following is classified as saponifiable?
a. terpene
_____2.
b. sphingolipid
b. complex
b. amylose
c. amylopectin
b. hemiacetal
d. aggregated
d. sucrose
c. amide
d. glycolyse
Which of the following groups is characteristic of a carbohydrate:
a. amide
_____ 6.
c. non-saponifiable
The cyclic form of glucose occurs because of the formation of:
a. ester
_____ 5.
d. wax
Structurally, glycogen is most similar to:
a. cellulose
_____ 4.
c. prostaglandin
A lipid is hydrolyzed to form a mixture of fatty acids, glycerol, and phosphate.
The lipid would be classified as:
a. simple
_____ 3.
(15)
b. ester
c. carboxyl
d. alcohol
Which of the following can exist as enantiomers?:
a.
H2
C
H3C
H
C
C
H2
c.
O
H
C
H3C
CH
O
CH 3
b.
H2
C
H3C
d.
H
C
CH
O
H
C
O
H
C
CH
CH3
_____ 7.
_____ 8.
CH 3
How many chiral carbons are in altrose?:
a. 2
b. 5
O
c. 4
d. 6
H
b. acid
OH
OH
OHC
CH 2OH
OH
A functional group found in fats is:
a. alcohol
OH
c. ester
d. amide
H
H
H
_____ 9.
One of the features of a model of a membrane is:
a. pleated sheet b. lipid bilayer
_____ 10.
Which of the following sugars fails to give a positive Benedict’s test?:
a. glucose
_____ 11.
c. hydrophilic sheet d. microfilament
b. galactose
c. fructose
d. sucrose
Determine the type of glycosidic linkage in the molecule below:
OH OH
a. alpha-1, 4
b. beta-1,4
c. alpha-1, 6
d. beta-1, 6
H
O
H
H OH
H
HO
H
OH
H
O
O
H
H
HO
OH
_____ 12.
OH
H
OH
OHC
H
CH 2OH
H
H
OH
b. ketohexose
b. C17H33COOH
b.
d. hemiacetal
c. C17H29COOH
d. C17H31COOH
2
c. 6
d. 8
e. 16
Which form of monosaccharides are preferred by human cells:
a. D
2.
c. pyranose
Of the sixteen aldohexoses, how many exist in the L form:
a. none
_____ 15.
OH
Which of the following fatty acids has the lowest melting point?:
a. C19H39COOH
_____ 14.
H
H
a. aldohexose
_____ 13.
is a:
OH
b. L
c. both D and L
d. neither D nor L
a.
Explain why lipids are so water insoluble while carbohydrates of the same
approximate molar mass are extremely soluble.
(4)
b.
This molecule has chiral carbons yet is not optically active. Explain why. (4)
H
H
H
H
OHC
CHO
OH
OH
OH
OH
3.
Provide the classification for biochemical compound below.
CH 3
(8)
OH
O
OH
HO
_____________________________
_______________________________
OH
OH OH
OH O
HO
H
H
H
COOH
H
H
OH
_________________________________
OH
__________________________________
4. Use the compounds below the answer the questions that follow:
CHO
CHO
CHO
CHO
H
OH
HO
H
H
H
OH
HO
H
HO
H
OH
H
OH
H
OH
HO
H
H
OH
H
OH
H
OH
HO
H
CH 2OH
A
CH 2OH
H
OH
H
H
OH
CH 2OH
B
a. List any pairs of isomers.
OH
C
CH 2OH
D
_______________________________________
(3)
b. List any pairs of stereoisomers. ______________________________________
(3)
c. List any pairs of enantiomers.
(3)
_________________________________
d. Label the chiral carbons on D with stars.
(2)
5.
a.
Explain from a chemical perspective why lipids tend to form bilayers.
Illustrated diagrams welcome.
(4)
b.
Amylopectin has a much more branched structure than amylose even though they
are both composed of glucose molecules. Explain.
(4)