1
WGU C785 Final Exam 2026 Study Guide |
Practice Questions with Answer Explanations
& Comprehensive Exam Prep
THIS EXAM INCLUDES;
• Comprehensive WGU C785 Final Exam Review
• Chapter and Topic-Based Practice Questions
• Multiple-Choice and Scenario-Based Questions
• Detailed Answer Explanations and Rationales
• Coverage of Key Course Concepts
• Self-Assessment and Knowledge Checks
• Digital PDF Format
• Ideal for Final Exam Preparation and Course Review
,2
WGU C785 Final Exam 2026 Study Guide | Practice
Questions with Answer Explanations & Comprehensive
Exam Prep
SECTION 1: AMINO ACIDS AND PROTEIN STRUCTURE
(Questions 1-10)
Question 1
Which of the following correctly identifies the four components of an amino acid?
A) Amino group, carboxyl group, alpha carbon, and variable group
B) Amino group, phosphate group, alpha carbon, and variable group
C) Carboxyl group, hydroxyl group, alpha carbon, and variable group
D) Amino group, carboxyl group, beta carbon, and variable group
Answer: A) Amino group, carboxyl group, alpha carbon, and variable group
Rationale: The basic structure of an amino acid consists of an amino group (NH2 or
NH3), a carboxyl group (COO or COOH), an alpha carbon (central carbon), and a variable
group (R group) that determines the amino acid's properties. Option B incorrectly
includes a phosphate group instead of a carboxyl group. Option C incorrectly includes a
hydroxyl group instead of an amino group. Option D incorrectly identifies a beta carbon
instead of an alpha carbon.
Question 2
A student identifies an amino acid side chain ending in "CH". How should this
amino acid be classified?
,3
A) Polar
B) Charged
C) Non-polar/hydrophobic
D) Hydrophilic
Answer: C) Non-polar/hydrophobic
Rationale: Non-polar/hydrophobic side chains end with "CH" (methyl, ethyl, etc.) or can
be remembered as "can't have" water. Polar side chains end with OH, SH, or NH.
Charged side chains end with a charge (positive or negative). Hydrophilic is a general
term for water-loving molecules, but this specific classification is non-
polar/hydrophobic.
Question 3
Which type of bond is formed between two cysteine amino acid side chains?
A) Hydrogen bond
B) Ionic bond
C) Disulfide bond
D) Hydrophobic interaction
Answer: C) Disulfide bond
Rationale: Disulfide bonds are the strongest bonds formed between reduction agents
and are specifically formed between SH (sulfhydryl) groups of cysteine amino acids.
Hydrogen bonds are weak bonds between positive and negative charges. Ionic bonds
are between positive and negative charges. Hydrophobic interactions occur between
non-polar side chains.
Question 4
, 4
A protein is exposed to high temperatures. Which level of protein structure would
be affected first?
A) Primary structure
B) Secondary structure
C) Tertiary structure
D) Quaternary structure
Answer: B) Secondary structure
Rationale: Secondary structure is formed by hydrogen bonds that are susceptible to
temperature changes. Primary structure (peptide bonds) is more resistant to
temperature changes. Tertiary and quaternary structures are stabilized by various
interactions including hydrophobic, ionic, and disulfide bonds that are affected by
different environmental changes.
Question 5
Which environmental change would break hydrophobic bonds?
A) Temperature change
B) Salt or decreased pH
C) Reducing agents
D) Increased pH only
Answer: A) Temperature change
Rationale: Hydrophobic bonds are broken by temperature changes. Ionic bonds are
broken by salt or decreased pH. Hydrogen bonds are broken by temperature, change in
pH, or reducing agents. Disulfide bonds are broken by reducing agents. Each type of
bond has specific environmental conditions that disrupt it.
Question 6
WGU C785 Final Exam 2026 Study Guide |
Practice Questions with Answer Explanations
& Comprehensive Exam Prep
THIS EXAM INCLUDES;
• Comprehensive WGU C785 Final Exam Review
• Chapter and Topic-Based Practice Questions
• Multiple-Choice and Scenario-Based Questions
• Detailed Answer Explanations and Rationales
• Coverage of Key Course Concepts
• Self-Assessment and Knowledge Checks
• Digital PDF Format
• Ideal for Final Exam Preparation and Course Review
,2
WGU C785 Final Exam 2026 Study Guide | Practice
Questions with Answer Explanations & Comprehensive
Exam Prep
SECTION 1: AMINO ACIDS AND PROTEIN STRUCTURE
(Questions 1-10)
Question 1
Which of the following correctly identifies the four components of an amino acid?
A) Amino group, carboxyl group, alpha carbon, and variable group
B) Amino group, phosphate group, alpha carbon, and variable group
C) Carboxyl group, hydroxyl group, alpha carbon, and variable group
D) Amino group, carboxyl group, beta carbon, and variable group
Answer: A) Amino group, carboxyl group, alpha carbon, and variable group
Rationale: The basic structure of an amino acid consists of an amino group (NH2 or
NH3), a carboxyl group (COO or COOH), an alpha carbon (central carbon), and a variable
group (R group) that determines the amino acid's properties. Option B incorrectly
includes a phosphate group instead of a carboxyl group. Option C incorrectly includes a
hydroxyl group instead of an amino group. Option D incorrectly identifies a beta carbon
instead of an alpha carbon.
Question 2
A student identifies an amino acid side chain ending in "CH". How should this
amino acid be classified?
,3
A) Polar
B) Charged
C) Non-polar/hydrophobic
D) Hydrophilic
Answer: C) Non-polar/hydrophobic
Rationale: Non-polar/hydrophobic side chains end with "CH" (methyl, ethyl, etc.) or can
be remembered as "can't have" water. Polar side chains end with OH, SH, or NH.
Charged side chains end with a charge (positive or negative). Hydrophilic is a general
term for water-loving molecules, but this specific classification is non-
polar/hydrophobic.
Question 3
Which type of bond is formed between two cysteine amino acid side chains?
A) Hydrogen bond
B) Ionic bond
C) Disulfide bond
D) Hydrophobic interaction
Answer: C) Disulfide bond
Rationale: Disulfide bonds are the strongest bonds formed between reduction agents
and are specifically formed between SH (sulfhydryl) groups of cysteine amino acids.
Hydrogen bonds are weak bonds between positive and negative charges. Ionic bonds
are between positive and negative charges. Hydrophobic interactions occur between
non-polar side chains.
Question 4
, 4
A protein is exposed to high temperatures. Which level of protein structure would
be affected first?
A) Primary structure
B) Secondary structure
C) Tertiary structure
D) Quaternary structure
Answer: B) Secondary structure
Rationale: Secondary structure is formed by hydrogen bonds that are susceptible to
temperature changes. Primary structure (peptide bonds) is more resistant to
temperature changes. Tertiary and quaternary structures are stabilized by various
interactions including hydrophobic, ionic, and disulfide bonds that are affected by
different environmental changes.
Question 5
Which environmental change would break hydrophobic bonds?
A) Temperature change
B) Salt or decreased pH
C) Reducing agents
D) Increased pH only
Answer: A) Temperature change
Rationale: Hydrophobic bonds are broken by temperature changes. Ionic bonds are
broken by salt or decreased pH. Hydrogen bonds are broken by temperature, change in
pH, or reducing agents. Disulfide bonds are broken by reducing agents. Each type of
bond has specific environmental conditions that disrupt it.
Question 6
