Q. What is the effect of pH on peptide solubility?
-
A.
It has no effect
-
B.
It can increase solubility at all pH levels
-
C.
It can decrease solubility at certain pH levels
-
D.
It only affects hydrophobic peptides
Solution
The solubility of peptides can be affected by pH, as it influences the ionization of amino acid side chains.
Correct Answer:
C
— It can decrease solubility at certain pH levels
Learn More →
Q. What is the primary structure of a peptide?
-
A.
The sequence of amino acids
-
B.
The three-dimensional shape
-
C.
The arrangement of beta sheets
-
D.
The interaction with other peptides
Solution
The primary structure of a peptide refers to the linear sequence of amino acids linked by peptide bonds.
Correct Answer:
A
— The sequence of amino acids
Learn More →
Q. What is the role of disulfide bonds in peptides?
-
A.
To form peptide bonds
-
B.
To stabilize tertiary structure
-
C.
To create secondary structure
-
D.
To facilitate enzyme activity
Solution
Disulfide bonds form between cysteine residues and help stabilize the tertiary structure of peptides and proteins.
Correct Answer:
B
— To stabilize tertiary structure
Learn More →
Q. What is the typical length range of peptides?
-
A.
2 to 10 amino acids
-
B.
10 to 50 amino acids
-
C.
50 to 100 amino acids
-
D.
Over 100 amino acids
Solution
Peptides typically consist of 2 to 50 amino acids, while proteins are generally larger.
Correct Answer:
B
— 10 to 50 amino acids
Learn More →
Q. What type of interaction stabilizes the secondary structure of peptides?
-
A.
Hydrophobic interactions
-
B.
Ionic interactions
-
C.
Hydrogen bonds
-
D.
Van der Waals forces
Solution
Hydrogen bonds between the backbone amide and carbonyl groups stabilize the secondary structure, such as alpha helices and beta sheets.
Correct Answer:
C
— Hydrogen bonds
Learn More →
Q. Which bond is responsible for the primary structure of peptides?
-
A.
Hydrogen bonds
-
B.
Ionic bonds
-
C.
Peptide bonds
-
D.
Disulfide bonds
Solution
Peptide bonds are covalent bonds that link amino acids together to form the primary structure of peptides.
Correct Answer:
C
— Peptide bonds
Learn More →
Q. Which of the following is NOT a characteristic of peptides?
-
A.
They are made of amino acids
-
B.
They can form complex three-dimensional structures
-
C.
They are always larger than proteins
-
D.
They can have biological activity
Solution
Peptides are typically smaller than proteins and can range from just a few amino acids to several dozen.
Correct Answer:
C
— They are always larger than proteins
Learn More →
Q. Which of the following techniques is commonly used to determine the sequence of amino acids in a peptide?
-
A.
Nuclear magnetic resonance (NMR)
-
B.
Mass spectrometry
-
C.
X-ray crystallography
-
D.
Electrophoresis
Solution
Mass spectrometry is a widely used technique for determining the sequence of amino acids in peptides.
Correct Answer:
B
— Mass spectrometry
Learn More →
Q. Which property of peptides is influenced by the side chains of amino acids?
-
A.
Primary structure
-
B.
Secondary structure
-
C.
Tertiary structure
-
D.
Quaternary structure
Solution
The side chains (R groups) of amino acids influence the folding and interactions that determine the tertiary structure of peptides.
Correct Answer:
C
— Tertiary structure
Learn More →
Showing 1 to 9 of 9 (1 Pages)
