Portage Biochemistry- Module 4 Exam Questions & Answers (Grade A+).docx

Portage Biochemistry- Module 4 Exam
Questions & Answers (Grade A+)
Is the following molecule an aldose or ketose? Briefly explain. -
correct answer ✅ketose. There is a C=O on the third carbon from
the top.


Which carbon in erythrose would tell you if the monosaccharide is
D or L? Give the carbon's number in your answer. -
correct answer ✅On carbon number 3, which is the penultimate
carbon.


Glucose and mannose are epimers. Name another epimer of
glucose besides mannose. -
correct answer ✅Galactose


Is the following structure a D or L carbohydrate? Briefly explain. -
correct answer ✅L. The -OH group is on the left side on the
penultimate carbon.


Does the compound C7H14O8 fit the formal definition of a
carbohydrate? Explain. -
correct answer ✅No. This compound has does not fit the formula
CnH2nOn as indicated in the module. There is one additional
oxygen in this compound.

, Portage Biochemistry- Module 4 Exam
Questions & Answers (Grade A+)
Which of the following is carbon number 3? (Indicate by the
appropriate letter.) -
correct answer ✅C


Which carbon in this molecule is the anomeric carbon? (Indicate by
the appropriate letter.) -
correct answer ✅A


Is the following a furan or pyran ring? Briefly explain. -
correct answer ✅furan. There are only five atoms in the ring: one
oxygen and four carbons.


When is the alpha 1→6 connection typically found in
carbohydrates? -
correct answer ✅The alpha 1→6 bond is found in polysaccharides
when branching occurs.


Is the following an alpha 1→4 or beta 1→4 connection? Briefly
explain. -
correct answer ✅This is a beta 1→4 because the molecule on the
left has the oxygen in the up, or beta, position.