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Essential Biochemistry - Chemistry Of Proteins (Section 1)

1
What is the main component of the tertiary structure of a protein?
Answer
(C)
The three-dimensional shape of a single polypeptide chain
2
Which level of protein structure involves the interactions between two or more polypeptide chains?
Answer
(D)
Quaternary
3
What does the term "denaturation" refer to in the context of proteins?
Answer
(B)
The loss of a protein's three-dimensional structure.
4
What is the role of a prosthetic group in a conjugated protein?
Answer
(C)
To assist in the protein's function
5
Which of the following is NOT a standard amino acid?
Answer
(D)
Selenocysteine
6
The greatest buffering capacity at physiological pH would be provided by a protein, rich in which of the following amino acids?
Answer
(C)
Histidine
7
Which amino acid can be modified to form a neurotransmitter?
Answer
(B)
Tyrosine
8
What is the role of a zwitterion in the context of amino acids?
Answer
(D)
A molecule with both positive and negative charges
9
Glutathione is found in all mammalian cells except
Answer
(A)
RBC
10
What is the tertiary structure of a protein?
Answer
(C)
The three-dimensional structure of a single polypeptide chain.
11
What is the function of chaperones in protein folding?
Answer
(B)
They prevent aggregation and assist in proper folding.
12
Albumin is deficient in which of the following amino acid?
Answer
B
D
13
What is the isoelectric point (pI) of an amino acid?
Answer
(D)
The pH at which the amino acid is zwitterionic (neutral).
14
Which type of bond is responsible for holding the primary structure of a protein together?
Answer
(B)
Peptide bond
15
In proteins, peptide bonds is an example of:
Answer
(A)
Primary structure
16
What is the function of a structural protein?
Answer
(A)
To provide support and shape to cells and tissues.
17
Which of the following properties are important in distinguishing between amino acids?
Answer
(B)
The structure of the side chain (R group).
18
Which of the following is NOT a function of proteins?
Answer
(C)
Storing genetic information
19
Which type of amino acids are typically found on the interior of a globular protein?
Answer
(C)
Nonpolar
20
What is the primary function of enzymes?
Answer
(B)
To catalyze biochemical reactions
21
Which of the following acts as a redox buffer?
Answer
(C)
Glutathione
22
Which of the following statements about protein denaturation is true?
Answer
B
C
D
23
What is the primary function of proteins?
Answer
(C)
Building and repairing tissues
24
What is the function of antibodies?
Answer
(C)
To protect the body against foreign substances
25
Which of the following is a function of structural proteins?
Answer
(C)
Providing support and shape to cells and tissues
26
Which types of interactions contribute to a protein's tertiary structure?
Answer
A
B
C
D
27
Which of the following is an example of a conjugated protein?
Answer
(C)
Hemoglobin
28
What is the name of the bond that links amino acids together in a protein?
Answer
(C)
Peptide bond
29
Which of the following is an aromatic amino acid?
Answer
(C)
Phenylalanine
30
Which of the following is a denaturing agent?
Answer
(A)
Heat
31
Which of the following is NOT a common type of secondary structure in proteins?
Answer
(D)
Triple helix
32
Which amino acid is often involved in acid-base catalysis within an enzyme's active site?
Answer
(C)
Histidine
33
Which of the following is a kind of secondary structure?
Answer
(D)
All of the above
34
Which level of protein structure describes the sequence of amino acids?
Answer
(A)
Primary
35
Which level of protein structure describes the sequence of amino acids?
Answer
(A)
Primary
36
Which amino acid contains an imidazole ring?
Answer
(A)
Histidine
37
Which of the following is a characteristic of a zwitterion?
Answer
(C)
It is neutral but has both positive and negative charges.
38
Which of the following best describes the role of chaperone proteins?
Answer
(C)
They assist in protein folding and prevent aggregation.
39
What is the name of the process where a protein loses its natural shape?
Answer
(C)
Denaturation
40
The amino acid present in protein is:
Answer
(A)
Phenylalanine
41
During denaturation of protein the following bonds are disrupted, except
Answer
(C)
Peptide
42
What is the role of the side chain (R-group) of an amino acid?
Answer
(B)
To determine the chemical properties of the amino acid
43
Amino acids are linked together by which type of bond?
Answer
(B)
Peptide bond
44
What is a zwitterion?
Answer
(C)
A molecule with both positive and negative charges but a net charge of zero.
45
Which of the following is a non-protein amino acid?
Answer
(D)
Cystine
46
What type of bond links the monomers of a protein together?
Answer
(B)
Peptide bond
47
What is the role of a catalyst?
Answer
(D)
To decrease the activation energy of a reaction
48
What is the function of albumin?
Answer
(C)
Maintaining osmotic pressure
49
What are some examples of fibrous proteins?
Answer
A
B
D
50
What level of protein structure is affected by denaturation?
Answer
B
C
D