Q. What is quaternary structure in proteins?
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A.
The sequence of amino acids
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B.
The folding of a single polypeptide chain
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C.
The arrangement of multiple polypeptide chains
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D.
The interaction of the protein with other molecules
Solution
Quaternary structure refers to the arrangement and interaction of multiple polypeptide chains in a protein.
Correct Answer:
C
— The arrangement of multiple polypeptide chains
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Q. What is the tertiary structure of a protein?
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A.
The overall 3D shape of a single polypeptide chain
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B.
The sequence of amino acids
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C.
The arrangement of multiple polypeptide chains
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D.
The interaction of the protein with other molecules
Solution
The tertiary structure of a protein refers to the overall three-dimensional shape formed by the folding of a single polypeptide chain.
Correct Answer:
A
— The overall 3D shape of a single polypeptide chain
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Q. What role do chaperone proteins play in protein structure?
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A.
They catalyze reactions
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B.
They assist in protein folding
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C.
They provide structural support
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D.
They transport proteins
Solution
Chaperone proteins assist in the proper folding of other proteins, preventing misfolding and aggregation.
Correct Answer:
B
— They assist in protein folding
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Q. What type of bond forms between cysteine residues in proteins?
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A.
Hydrogen bonds
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B.
Ionic bonds
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C.
Disulfide bonds
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D.
Peptide bonds
Solution
Disulfide bonds form between the sulfur atoms of cysteine residues, contributing to the stability of protein structure.
Correct Answer:
C
— Disulfide bonds
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Q. Which level of protein structure is affected by denaturation?
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A.
Primary structure
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B.
Secondary structure
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C.
Tertiary structure
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D.
All of the above
Solution
Denaturation can affect all levels of protein structure, particularly secondary, tertiary, and quaternary structures.
Correct Answer:
D
— All of the above
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Q. Which of the following interactions is NOT involved in stabilizing tertiary structure?
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A.
Hydrophobic interactions
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B.
Ionic bonds
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C.
Hydrogen bonds
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D.
Peptide bonds
Solution
Peptide bonds link amino acids together in the primary structure, but do not stabilize the tertiary structure.
Correct Answer:
D
— Peptide bonds
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