Biochem 210 Module 3 Exam - Portage Learning Latest Update 2026.
Domain 1: Proteins - Structure & Function (Q1–35)
1. Proteins perform nearly all the work in cells and organisms. Which of the
following is NOT a primary function of proteins?
A) Catalysis of chemical reactions
B) Energy storage in the form of ATP
C) Structural support for cells and tissues
D) Transport of molecules within the organism
Answer: B
Rationale: Proteins function in catalysis (enzymes), structure (collagen), transport
(hemoglobin), immunology (antibodies), and storage. However, ATP is the
primary energy storage molecule, not a protein. Proteins are synthesized from
amino acids and perform specialized cellular roles .
2. Which type of protein provides strength to cartilage, skin, and tendons?
A) Hemoglobin
B) Protease
,C) Collagen
D) Keratin
Answer: C
Rationale: Collagen is a structural protein found in cartilage, skin, and tendons. It
provides strength and support to these tissues. Hemoglobin functions in oxygen
transport, protease catalyzes protein breakdown, and keratin is found in hair and
nails .
3. Hemoglobin's primary function in the body is to:
A) Catalyze the breakdown of proteins
B) Provide structural support to red blood cells
C) Carry oxygen from the lungs to tissues
D) Store amino acids for later use
Answer: C
,Rationale: Hemoglobin is a transport protein that carries oxygen from the lungs to
the body's tissues. It is a classic example of a globular protein specialized for
molecular transport .
4. A protease is an example of a protein with which function?
A) Structural
B) Catalytic (enzymatic)
C) Transport
D) Storage
Answer: B
Rationale: Proteases are enzymes that catalyze the breakdown of proteins by
hydrolyzing peptide bonds. They speed up chemical reactions, making them
catalytic proteins. Most enzymes have an "-ase" suffix .
5. True or False: According to Module 3, a compound must have a molecular mass
greater than 10,000 g/mol to be considered a macromolecule.
Answer: False
, Rationale: A macromolecule is generally considered to have a molecular mass of
approximately 1,000 g/mol or greater. Polypeptides are considered proteins when
they reach about 100 amino acids, corresponding to about 10,000 Da (10 kDa) .
6. True or False: All proteins are enzymes.
Answer: False
Rationale: While all enzymes are proteins (with the exception of some ribozymes
that are RNA), not all proteins are enzymes. Proteins serve many functions
including structural roles, transport, immunology, and signaling, only some of
which are catalytic .
7. A protein that is "intrinsically disordered" is characterized by:
A) A highly organized, stable three-dimensional structure
B) Random conformation and lack of a defined structure
C) Extensive disulfide bond formation
D) Multiple subunits joined together
Domain 1: Proteins - Structure & Function (Q1–35)
1. Proteins perform nearly all the work in cells and organisms. Which of the
following is NOT a primary function of proteins?
A) Catalysis of chemical reactions
B) Energy storage in the form of ATP
C) Structural support for cells and tissues
D) Transport of molecules within the organism
Answer: B
Rationale: Proteins function in catalysis (enzymes), structure (collagen), transport
(hemoglobin), immunology (antibodies), and storage. However, ATP is the
primary energy storage molecule, not a protein. Proteins are synthesized from
amino acids and perform specialized cellular roles .
2. Which type of protein provides strength to cartilage, skin, and tendons?
A) Hemoglobin
B) Protease
,C) Collagen
D) Keratin
Answer: C
Rationale: Collagen is a structural protein found in cartilage, skin, and tendons. It
provides strength and support to these tissues. Hemoglobin functions in oxygen
transport, protease catalyzes protein breakdown, and keratin is found in hair and
nails .
3. Hemoglobin's primary function in the body is to:
A) Catalyze the breakdown of proteins
B) Provide structural support to red blood cells
C) Carry oxygen from the lungs to tissues
D) Store amino acids for later use
Answer: C
,Rationale: Hemoglobin is a transport protein that carries oxygen from the lungs to
the body's tissues. It is a classic example of a globular protein specialized for
molecular transport .
4. A protease is an example of a protein with which function?
A) Structural
B) Catalytic (enzymatic)
C) Transport
D) Storage
Answer: B
Rationale: Proteases are enzymes that catalyze the breakdown of proteins by
hydrolyzing peptide bonds. They speed up chemical reactions, making them
catalytic proteins. Most enzymes have an "-ase" suffix .
5. True or False: According to Module 3, a compound must have a molecular mass
greater than 10,000 g/mol to be considered a macromolecule.
Answer: False
, Rationale: A macromolecule is generally considered to have a molecular mass of
approximately 1,000 g/mol or greater. Polypeptides are considered proteins when
they reach about 100 amino acids, corresponding to about 10,000 Da (10 kDa) .
6. True or False: All proteins are enzymes.
Answer: False
Rationale: While all enzymes are proteins (with the exception of some ribozymes
that are RNA), not all proteins are enzymes. Proteins serve many functions
including structural roles, transport, immunology, and signaling, only some of
which are catalytic .
7. A protein that is "intrinsically disordered" is characterized by:
A) A highly organized, stable three-dimensional structure
B) Random conformation and lack of a defined structure
C) Extensive disulfide bond formation
D) Multiple subunits joined together
