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Essential Biochemistry - Chemistry Of Proteins (Section 4)

1
Which of the following amino acids has a side chain that can form hydrogen bonds?
Answer
A
B
D
2
Which of the following can denature a protein?
Answer
A
B
3
Which amino acid can act as a buffer in solution?
Answer
A
B
C
4
Which of the following describes the primary structure of a protein?
Answer
(A)
The sequence of amino acids
5
Glutathione is found in all mammalian cells except:
Answer
(C)
Neurons
6
All of the following forces may play a role in the formation of tertiary structure, except:
Answer
(D)
Peptide bonds
7
Which of the following is an example of an amphoteric molecule?
Answer
(B)
Water (H2O)
8
Which of the following is a kind of secondary structure?
Answer
A
B
D
9
What determines the specificity of an enzyme?
Answer
(A)
The amino acid sequence of the enzyme.
10
What are the main components of the primary structure of a protein?
Answer
A
B
11
Which amino acid is the precursor for the synthesis of melanin?
Answer
(C)
Tyrosine
12
What type of interactions contribute to the tertiary structure of a protein?
Answer
A
B
C
D
13
All amino acids found in proteins are optically active, except:
Answer
(B)
Glycine
14
Which of the following statements is true regarding the role of proline in protein structure?
Answer
(A)
Proline disrupts alpha-helices.
15
What is the role of albumin in the body?
Answer
(A)
Transport of fatty acids
16
What is the role of the tertiary structure of a protein?
Answer
(C)
To create the 3D shape of a single polypeptide chain.
17
What type of interactions are involved in the formation of beta-sheets?
Answer
(B)
Hydrogen bonds
18
What is the main purpose of essential amino acids?
Answer
(A)
They are required in the diet as the body cannot produce them.
19
What is the main component of the backbone of a polypeptide?
Answer
(C)
Amino and carboxyl groups
20
Which of the following is an example of a fibrous protein?
Answer
(C)
Keratin
21
Which of the following is a characteristic of an enzyme?
Answer
(B)
It speeds up chemical reactions.
22
Which of the following are the standard amino acids?
Answer
(A)
20
23
What is the primary function of proteins in the body?
Answer
(B)
To provide the structural framework for cells
24
Which level of protein structure describes the interactions between multiple polypeptide chains?
Answer
(D)
Quaternary
25
Which of the following acts as a redox buffer?
Answer
(C)
Glutathione
26
Which of the following is NOT a function of proteins?
Answer
(C)
Storage of genetic information
27
What is the function of a zwitterion in an amino acid?
Answer
(B)
To act as a buffer
28
What is the basic unit of a protein?
Answer
(A)
Amino acids
29
What functional group is found in all amino acids?
Answer
(D)
Both carboxyl and amino
30
What is the quaternary structure of a protein?
Answer
(D)
The arrangement of multiple polypeptide chains in a protein complex
31
Which of the following is a post-translational modification?
Answer
A
B
C
32
What is the definition of a peptide?
Answer
(B)
A chain of amino acids linked by peptide bonds.
33
What type of amino acid is Histidine?
Answer
(B)
Basic
34
What is the function of Glutathione?
Answer
(A)
As an antioxidant
35
Which of the following cause denaturation of protein?
Answer
A
B
C
D
36
What is the role of disulfide bonds in protein structure?
Answer
(C)
Stabilize against denaturation and confer additional stability
37
Which of the following is a characteristic of a zwitterion?
Answer
(B)
It carries both positive and negative charges.
38
What kind of bonds stabilize the tertiary structure?
Answer
A
B
C
39
Which amino acids are considered ketogenic?
Answer
A
B
40
Which of the following is a non-protein amino acid?
Answer
(D)
Cystine
41
The amino acid present in protein is:
Answer
(A)
Phenylalanine
42
In protein, triple helix is an example of:
Answer
(B)
Secondary structure
43
What is the term for a protein that facilitates a biological reaction?
Answer
(A)
Enzyme
44
Which of the following amino acids contains a sulfur atom?
Answer
(C)
Cysteine
45
What type of interaction primarily stabilizes the tertiary structure of a protein?
Answer
(D)
All of the above
46
Which of the following statements about protein folding is correct?
Answer
(B)
It is primarily driven by the hydrophobic effect.
47
The distance between adjacent amino acids is:
Answer
(B)
1.5 Å
48
What is the primary role of disulfide bonds in proteins?
Answer
(B)
To stabilize the tertiary and quaternary structures
49
Which of the following is a metallic element?
Answer
(C)
Metaproteins
50
Which amino acid does not have a chiral carbon?
Answer
(A)
Glycine