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Essential Biochemistry - Chemistry Of Proteins (Section 3)

1
Which of the following is NOT a characteristic of a globular protein?
Answer
(C)
Involved in structural support
2
Which of the following is the best description of a protein's tertiary structure?
Answer
(C)
The three-dimensional shape of a single polypeptide chain
3
Which level of protein structure describes the folding of the polypeptide chain into a 3D shape?
Answer
(C)
Tertiary
4
What is the basic structural unit of a protein?
Answer
(B)
An amino acid
5
Which amino acid is the precursor to the neurotransmitter serotonin?
Answer
(B)
Tryptophan
6
Which of the following are common characteristics of globular proteins?
Answer
A
C
7
Denaturation of proteins leads to:
Answer
(B)
Loss of biological activity
8
Which of the following is an example of a fibrous protein?
Answer
(B)
Collagen
9
What are the main components of a peptide bond?
Answer
(A)
C-O and N-H
10
Which of the following is an example of a post-translational modification?
Answer
(C)
Phosphorylation
11
Which of the following factors can denature a protein?
Answer
A
B
C
D
12
What are the key characteristics of globular proteins?
Answer
A
B
C
13
Which of the following is NOT an essential amino acid?
Answer
(C)
Alanine
14
What is the isoelectric point of an amino acid?
Answer
(A)
The pH at which the amino acid is neutral
15
Which of the following amino acids is a sulfur-containing amino acid?
Answer
(C)
Cysteine
16
What is the name of the secondary structure formed by the amino acids chain?
Answer
(C)
both alpha helix and beta sheets
17
Which of the following statements is true regarding protein folding?
Answer
(A)
Misfolding leads to non-functional proteins.
18
Which amino acid is non-polar and considered to be a ring structure amino acid?
Answer
(B)
Proline
19
What type of bonds stabilize the secondary structure of proteins?
Answer
(B)
Hydrogen bonds
20
Which of the following is not a primary derivative of protein?
Answer
(A)
Proteins
21
Which of the following are examples of conjugated proteins?
Answer
A
B
22
What is the term for the 3D arrangement of all atoms in a protein?
Answer
(C)
Tertiary structure
23
Which of the following is an example of a fibrous protein?
Answer
(C)
Collagen
24
What is a polypeptide?
Answer
(B)
A chain of amino acids linked by peptide bonds
25
Which amino acids can be phosphorylated?
Answer
A
B
C
26
What does it mean for a protein to be amphipathic?
Answer
(A)
It has both hydrophobic and hydrophilic regions
27
What type of interaction is primarily responsible for the secondary structure of a protein?
Answer
(A)
Hydrogen bonds
28
Which of the following is NOT a function of proteins?
Answer
(D)
Energy storage
29
What type of bond links amino acids together to form a polypeptide chain?
Answer
(C)
Peptide bond
30
Which level of protein structure does the alpha helix belong to?
Answer
(B)
Secondary
31
Which of the following amino acids is a basic amino acid?
Answer
(C)
Lysine
32
What is a zwitterion?
Answer
(B)
An amino acid that exists as a dipole ion
33
Which of the following is a modified amino acid?
Answer
A
B
34
In humans all of the following amino acids are essential, except:
Answer
(C)
Glycine
35
What is the role of the R group (side chain) in an amino acid?
Answer
(B)
To provide the amino acid's unique chemical properties
36
During denaturation of protein the following bonds are disrupted, except:
Answer
(C)
Peptide
37
Which of the following is a disulphide bond?
Answer
(B)
Cysteine-Cysteine
38
What types of side chains can amino acids have?
Answer
(D)
All of the mentioned above
39
Which level of protein structure is disrupted by denaturation?
Answer
(B)
Secondary and Tertiary
40
What does the term "denaturation" refer to in the context of proteins?
Answer
(C)
The loss of a protein's native structure
41
Albumin is deficient in which of the following amino acid?
Answer
(B)
Tryptophan
42
Which of the following is NOT an example of a post-translational modification?
Answer
(D)
Transcription
43
What is an example of a protein that transports oxygen?
Answer
(C)
Hemoglobin
44
What kind of bonds are formed when a primary structure converts to a secondary structure?
Answer
(A)
Hydrogen bonds
45
What type of bond links amino acids together?
Answer
(B)
Peptide
46
Which of the following is a function of proteins in the body?
Answer
A
B
C
47
What is the primary role of chaperones in protein folding?
Answer
(C)
To assist in correct protein folding
48
The greatest buffering capacity at physiological pH would be provided by a protein, rich in which of the following amino acids:
Answer
(C)
Histidine
49
Which class of amino acids contains only non-essential amino acids?
Answer
(B)
Acidic
50
Which level of protein structure involves the spatial arrangement of amino acid residues that are far apart in the primary structure?
Answer
(C)
Tertiary structure