WGU C785 Final Exam 2024 With All The Correct Answers
SECTION 1: AMINO ACIDS & PROTEIN STRUCTURE
Question 1
What is the basic structure of an amino acid?
A) Amino group (NH2 or NH3), carboxyl group (COO or COOH), alpha
carbon (C), and variable group
B) Only an amino group and a carboxyl group
C) A sugar backbone with nitrogenous base
D) A glycerol molecule with fatty acid chains
Correct Answer: A
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 (C), and a variable group (R group or side chain).
Question 2
How do you identify non-polar/hydrophobic side chains?
A) End with CH or "can't have" water
B) End with OH, SH, or NH
C) End with a charge
D) Contain a phosphate group
Correct Answer: A
,Rationale: Non-polar/hydrophobic side chains end with CH or "can't
have" water. They do not interact favorably with water.
Question 3
How do you identify polar side chains?
A) End with CH
B) End with OH, SH, or NH
C) End with a charge
D) Contain a benzene ring
Correct Answer: B
Rationale: Polar side chains end with OH, SH, or NH. They have
partial charges and can form hydrogen bonds with water.
Question 4
How do you identify charged side chains?
A) End with CH
B) End with OH
C) End with a charge
D) End with SH
Correct Answer: C
Rationale: Charged side chains end with a charge (positive or
negative). They are hydrophilic and interact strongly with water.
,Question 5
What kinds of bonds do non-polar/hydrophobic side chains make?
A) Ionic bonds
B) Hydrophobic interactions
C) Hydrogen bonds
D) Disulfide bonds
Correct Answer: B
Rationale: Non-polar/hydrophobic side chains make hydrophobic
interactions. They cluster together to avoid water.
Question 6
What are the 4 levels of protein structure?
A) Primary, Secondary, Tertiary, Quaternary
B) Alpha, Beta, Gamma, Delta
C) Simple, Complex, Compound, Derived
D) Linear, Folded, Twisted, Combined
Correct Answer: A
Rationale: The 4 levels of protein structure are: Primary - linear
structure; Secondary - folded into helix or pleated sheet caused by
hydrogen bonding; Tertiary - 3D structure caused by side chain
, interactions; Quaternary - 1+ amino acid chains combine = multiple
subunits MUST have 1+ subunit.
Question 7
What is the primary structure of a protein?
A) Linear structure of amino acids
B) Folded into helix or pleated sheet
C) 3D structure caused by side chain interactions
D) Multiple subunits combined
Correct Answer: A
Rationale: Primary structure is the linear sequence of amino acids
in a polypeptide chain.
Question 8
What is the secondary structure of a protein?
A) Linear structure
B) Folded into helix or pleated sheet caused by hydrogen bonding
C) 3D structure caused by side chain interactions
D) Multiple subunits combined
Correct Answer: B
SECTION 1: AMINO ACIDS & PROTEIN STRUCTURE
Question 1
What is the basic structure of an amino acid?
A) Amino group (NH2 or NH3), carboxyl group (COO or COOH), alpha
carbon (C), and variable group
B) Only an amino group and a carboxyl group
C) A sugar backbone with nitrogenous base
D) A glycerol molecule with fatty acid chains
Correct Answer: A
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 (C), and a variable group (R group or side chain).
Question 2
How do you identify non-polar/hydrophobic side chains?
A) End with CH or "can't have" water
B) End with OH, SH, or NH
C) End with a charge
D) Contain a phosphate group
Correct Answer: A
,Rationale: Non-polar/hydrophobic side chains end with CH or "can't
have" water. They do not interact favorably with water.
Question 3
How do you identify polar side chains?
A) End with CH
B) End with OH, SH, or NH
C) End with a charge
D) Contain a benzene ring
Correct Answer: B
Rationale: Polar side chains end with OH, SH, or NH. They have
partial charges and can form hydrogen bonds with water.
Question 4
How do you identify charged side chains?
A) End with CH
B) End with OH
C) End with a charge
D) End with SH
Correct Answer: C
Rationale: Charged side chains end with a charge (positive or
negative). They are hydrophilic and interact strongly with water.
,Question 5
What kinds of bonds do non-polar/hydrophobic side chains make?
A) Ionic bonds
B) Hydrophobic interactions
C) Hydrogen bonds
D) Disulfide bonds
Correct Answer: B
Rationale: Non-polar/hydrophobic side chains make hydrophobic
interactions. They cluster together to avoid water.
Question 6
What are the 4 levels of protein structure?
A) Primary, Secondary, Tertiary, Quaternary
B) Alpha, Beta, Gamma, Delta
C) Simple, Complex, Compound, Derived
D) Linear, Folded, Twisted, Combined
Correct Answer: A
Rationale: The 4 levels of protein structure are: Primary - linear
structure; Secondary - folded into helix or pleated sheet caused by
hydrogen bonding; Tertiary - 3D structure caused by side chain
, interactions; Quaternary - 1+ amino acid chains combine = multiple
subunits MUST have 1+ subunit.
Question 7
What is the primary structure of a protein?
A) Linear structure of amino acids
B) Folded into helix or pleated sheet
C) 3D structure caused by side chain interactions
D) Multiple subunits combined
Correct Answer: A
Rationale: Primary structure is the linear sequence of amino acids
in a polypeptide chain.
Question 8
What is the secondary structure of a protein?
A) Linear structure
B) Folded into helix or pleated sheet caused by hydrogen bonding
C) 3D structure caused by side chain interactions
D) Multiple subunits combined
Correct Answer: B
