Biochem Module 4 Exam Latest Update 2024-
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3 homopolysaccharides of glucose - CORRECT ANSWER: starch, glycogen, and
cellulose
A hike is lost in the wilderness and without food. He runs across several beetles with
hard chitin exoskeletons. Would he get nutrition in the form of glucose from eating these
beetles? Explain. - CORRECT ANSWER: The exoskeleton of beetles are composed of
chitin. Chitin is made of glucose residues with beta 1-->4 linkage, however, human
enzymes cannot breakdown this type of linkage. Human enzymes are able to
breakdown alpha 1-->4 linkages only. Therefore, the hiker will not intake glucose or get
nutrition from the beetle and should not eat it.
A) How many monosaccharide units are furanoses, and how many are pyranoses?
B) What is the linkage between the monosaccharides?
C) Is this a reducing sugar? - CORRECT ANSWER: A) 0 furanoses and 2 pyranoses
B) beta 1-->4
C) Yes, this is a reducing sugar because a true anomeric carbon is present.
A) Which carbon in the following molecule determines if the molecule is D or L? Explain.
B) Is this molecule D or L? - CORRECT ANSWER: A) Carbon D, the penultimate
carbon, determines if the molecules is D or L. In the case of glucose, this would be
carbon-5.
B) The monosaccharide is L because the -OH group is on the left side.
amylopectin has alpha 1-->6 branching about every ___ residues.
a. 1 to 10
, b. 8 to 12
c. 10 to 30
d. 24 to 30
e. no branching - CORRECT ANSWER: d. 24 to 30
amylose and amylopectin are both polymers of:
a. alpha-D-glucose
b. beta-D-glucose
c. galactose
d. idose
e. maltose - CORRECT ANSWER: a. alpha-D-glucose
*cellulose and chitin = beta-D-glucose
*starch, glycogen, amylose, and amylopectin = alpha-D-glucose
amylose folds into which of the following structures?
a. beta sheet
b. beta turn
c. alpha helix
d. D-configuration
e. alpha form - CORRECT ANSWER: c. alpha helix
based on the form of the cyclic sugar below in a Haworth projection, which Fischer
projection formula could have formed this structure? - CORRECT ANSWER: *look at the
Haworth projection and create Fischer projections for it
besides C, H, and O, what other element is found in the structure of chitin?
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