CHEM 210 BIOCHEMISTRY MODULE 3 ACTUAL EXAM 2026/2027 |
PORTAGE LEARNING QUESTIONS & VERIFIED ANSWERS | 100%
PASS GUARANTEE - A+ GRADED
CHEM 210 BIOCHEMISTRY
MODULE 3: AMINO ACIDS, PEPTIDES & PROTEINS
Original Exam-Style Practice & Detailed Answer Guide
Academic Year: 2026/2027
Institution: Portage Learning — course-aligned study resource
Study Resource Classification: Original practice questions .
TABLE OF CONTENTS
Section Content Questions
I Introduction 1–10
II Core Concepts 11–30
III Applied Scenarios 31–40
IV Critical Thinking 41–45
V Review Questions 46–50
SECTION I — INTRODUCTION
Question 1 — Multiple Choice
Which statement best describes an amino acid?
A. A carbohydrate containing a phosphate group
B. An organic molecule containing an amino group and a carboxyl group
C. A lipid composed exclusively of fatty acids
D. A nucleotide containing a nitrogenous base
Correct answer: B
Rationale:
Amino acids are the fundamental building blocks of proteins. A typical amino acid contains an
,amino group, a carboxyl group, a hydrogen atom, and a variable side chain attached to a central
α-carbon. The side chain determines many of the amino acid's chemical properties.
Carbohydrates, lipids, and nucleotides have different defining structures.
Question 2 — Multiple Choice
What determines the unique chemical properties of an amino acid?
A. Its peptide bond
B. Its α-carboxyl group
C. Its R group or side chain
D. Its amino group
Correct answer: C
Rationale:
The R group varies among the standard amino acids and determines properties such as polarity,
charge, hydrophobicity, and reactivity. The amino and carboxyl groups are common structural
features of amino acids, whereas the side chain provides much of the chemical diversity found in
proteins.
Question 3 — Short Answer
What are the two major functional groups present in a typical amino acid?
Correct answer: An amino group and a carboxyl group.
Rationale:
The amino group generally contains nitrogen and can accept a proton, while the carboxyl group
contains carbon, oxygen, and hydrogen and can donate a proton. These groups contribute
substantially to the acid–base behavior of amino acids.
Question 4 — Multiple Choice
Which element distinguishes amino acids from many simple carbohydrates?
A. Carbon
B. Hydrogen
C. Oxygen
D. Nitrogen
Correct answer: D
, Rationale:
Amino acids contain nitrogen because of their amino groups. Carbon, hydrogen, and oxygen are
also present in many carbohydrates, so nitrogen is particularly useful for distinguishing amino
acids from simple carbohydrate structures.
Question 5 — Multiple Choice
How many standard amino acids are commonly incorporated into proteins through the genetic
code?
A. 10
B. 15
C. 20
D. 25
Correct answer: C
Rationale:
The standard genetic code specifies 20 common proteinogenic amino acids. These amino acids
can be arranged in many different sequences to produce proteins with diverse structures and
functions.
Question 6 — Short Answer
What is the name of the bond that connects amino acids together in a polypeptide?
Correct answer: A peptide bond.
Rationale:
A peptide bond forms between the carboxyl group of one amino acid and the amino group of
another. The reaction involves removal of the components of water, making peptide-bond
formation a condensation or dehydration reaction.
Question 7 — Multiple Choice
Which molecule is released when a peptide bond is formed through a typical condensation
reaction?
A. Carbon dioxide
B. Water
C. Oxygen
D. ATP
PORTAGE LEARNING QUESTIONS & VERIFIED ANSWERS | 100%
PASS GUARANTEE - A+ GRADED
CHEM 210 BIOCHEMISTRY
MODULE 3: AMINO ACIDS, PEPTIDES & PROTEINS
Original Exam-Style Practice & Detailed Answer Guide
Academic Year: 2026/2027
Institution: Portage Learning — course-aligned study resource
Study Resource Classification: Original practice questions .
TABLE OF CONTENTS
Section Content Questions
I Introduction 1–10
II Core Concepts 11–30
III Applied Scenarios 31–40
IV Critical Thinking 41–45
V Review Questions 46–50
SECTION I — INTRODUCTION
Question 1 — Multiple Choice
Which statement best describes an amino acid?
A. A carbohydrate containing a phosphate group
B. An organic molecule containing an amino group and a carboxyl group
C. A lipid composed exclusively of fatty acids
D. A nucleotide containing a nitrogenous base
Correct answer: B
Rationale:
Amino acids are the fundamental building blocks of proteins. A typical amino acid contains an
,amino group, a carboxyl group, a hydrogen atom, and a variable side chain attached to a central
α-carbon. The side chain determines many of the amino acid's chemical properties.
Carbohydrates, lipids, and nucleotides have different defining structures.
Question 2 — Multiple Choice
What determines the unique chemical properties of an amino acid?
A. Its peptide bond
B. Its α-carboxyl group
C. Its R group or side chain
D. Its amino group
Correct answer: C
Rationale:
The R group varies among the standard amino acids and determines properties such as polarity,
charge, hydrophobicity, and reactivity. The amino and carboxyl groups are common structural
features of amino acids, whereas the side chain provides much of the chemical diversity found in
proteins.
Question 3 — Short Answer
What are the two major functional groups present in a typical amino acid?
Correct answer: An amino group and a carboxyl group.
Rationale:
The amino group generally contains nitrogen and can accept a proton, while the carboxyl group
contains carbon, oxygen, and hydrogen and can donate a proton. These groups contribute
substantially to the acid–base behavior of amino acids.
Question 4 — Multiple Choice
Which element distinguishes amino acids from many simple carbohydrates?
A. Carbon
B. Hydrogen
C. Oxygen
D. Nitrogen
Correct answer: D
, Rationale:
Amino acids contain nitrogen because of their amino groups. Carbon, hydrogen, and oxygen are
also present in many carbohydrates, so nitrogen is particularly useful for distinguishing amino
acids from simple carbohydrate structures.
Question 5 — Multiple Choice
How many standard amino acids are commonly incorporated into proteins through the genetic
code?
A. 10
B. 15
C. 20
D. 25
Correct answer: C
Rationale:
The standard genetic code specifies 20 common proteinogenic amino acids. These amino acids
can be arranged in many different sequences to produce proteins with diverse structures and
functions.
Question 6 — Short Answer
What is the name of the bond that connects amino acids together in a polypeptide?
Correct answer: A peptide bond.
Rationale:
A peptide bond forms between the carboxyl group of one amino acid and the amino group of
another. The reaction involves removal of the components of water, making peptide-bond
formation a condensation or dehydration reaction.
Question 7 — Multiple Choice
Which molecule is released when a peptide bond is formed through a typical condensation
reaction?
A. Carbon dioxide
B. Water
C. Oxygen
D. ATP
