CHEM 210 PORTAGE BIOCHEMISTRY MODULE 4 EXAM QUESTIONS & ANSWERS 2026-2027 | LATEST VER… EXAM
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
CHEM 210 Portage Biochemistry
Module 4 Exam Questions &
Answers 2026-2027 | Latest Verified
Study Guide | Practice Exam
(Rationales)
Verified Answers Exam Ready With Rationales
45 QUESTIONS
DOCUMENT OVERVIEW
This document contains 45 verified questions with correct answers and detailed rationales focused on
biochemistry concepts. It serves as a comprehensive study guide for students, offering clear explanations
and visual aids to enhance understanding of carbohydrate chemistry. Ideal for exam preparation, course
review, and certification study, it provides a robust resource for mastering key biochemistry topics.
CONTENTS
01 Carbohydrate Structure Q1–Q11
02 Carbohydrate Classification Q12–Q22
03 Epimers and Anomers Q23–Q28
04 Polysaccharides Q29–Q36
05 Carbohydrate Function Q37–Q45
E XA M Q U EST I O N S
Q1 QUESTION 1 OF 45
Page 1
,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.
RATIONALE
The presence of a carbonyl group (C=O) attached to the second carbon distinguishes ketoses from aldoses, which have the carbonyl group at the first
carbon. This structural difference defines the classification of the molecule as a ketose.
Q2 QUESTION 2 OF 45
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.
RATIONALE
The orientation of the hydroxyl group on carbon number 3, the penultimate carbon, determines whether erythrose is classified as D or L, based on the
Fischer projection convention where D indicates the hydroxyl group on the right and L indicates it on the left. This stereochemical configuration is
critical for understanding the molecule's behavior in biological systems.
Q3 QUESTION 3 OF 45
Page 2
, 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.
RATIONALE
The configuration of carbohydrates as D or L is determined by the position of the hydroxyl group on the penultimate carbon; if the -OH group is on the
left side in a Fischer projection, it designates the carbohydrate as L. This stereochemical classification is fundamental in distinguishing between
enantiomers in carbohydrate chemistry.
Q4 QUESTION 4 OF 45
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.
RATIONALE
Carbohydrates are defined by the empirical formula CnH2nOn, which reflects their structure as polyhydroxy aldehydes or ketones. The presence of an
additional oxygen in C7H14O8 indicates it does not conform to this formula, disqualifying it from being classified as a carbohydrate.
Q5 QUESTION 5 OF 45
Which of the following is carbon number 3? (Indicate by the appropriate letter.)
Page 3
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
CHEM 210 Portage Biochemistry
Module 4 Exam Questions &
Answers 2026-2027 | Latest Verified
Study Guide | Practice Exam
(Rationales)
Verified Answers Exam Ready With Rationales
45 QUESTIONS
DOCUMENT OVERVIEW
This document contains 45 verified questions with correct answers and detailed rationales focused on
biochemistry concepts. It serves as a comprehensive study guide for students, offering clear explanations
and visual aids to enhance understanding of carbohydrate chemistry. Ideal for exam preparation, course
review, and certification study, it provides a robust resource for mastering key biochemistry topics.
CONTENTS
01 Carbohydrate Structure Q1–Q11
02 Carbohydrate Classification Q12–Q22
03 Epimers and Anomers Q23–Q28
04 Polysaccharides Q29–Q36
05 Carbohydrate Function Q37–Q45
E XA M Q U EST I O N S
Q1 QUESTION 1 OF 45
Page 1
,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.
RATIONALE
The presence of a carbonyl group (C=O) attached to the second carbon distinguishes ketoses from aldoses, which have the carbonyl group at the first
carbon. This structural difference defines the classification of the molecule as a ketose.
Q2 QUESTION 2 OF 45
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.
RATIONALE
The orientation of the hydroxyl group on carbon number 3, the penultimate carbon, determines whether erythrose is classified as D or L, based on the
Fischer projection convention where D indicates the hydroxyl group on the right and L indicates it on the left. This stereochemical configuration is
critical for understanding the molecule's behavior in biological systems.
Q3 QUESTION 3 OF 45
Page 2
, 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.
RATIONALE
The configuration of carbohydrates as D or L is determined by the position of the hydroxyl group on the penultimate carbon; if the -OH group is on the
left side in a Fischer projection, it designates the carbohydrate as L. This stereochemical classification is fundamental in distinguishing between
enantiomers in carbohydrate chemistry.
Q4 QUESTION 4 OF 45
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.
RATIONALE
Carbohydrates are defined by the empirical formula CnH2nOn, which reflects their structure as polyhydroxy aldehydes or ketones. The presence of an
additional oxygen in C7H14O8 indicates it does not conform to this formula, disqualifying it from being classified as a carbohydrate.
Q5 QUESTION 5 OF 45
Which of the following is carbon number 3? (Indicate by the appropriate letter.)
Page 3
