Proteins (Elementary Idea of Amino Acids, Peptide Bond,...) NEET Questions

Organic Chemistry - Biomolecules

Proteins (Elementary Idea of Amino Acids, Peptide Bond,...) MCQ Questions


13.
The formation of a peptide bond between two amino acids involves the elimination of a small molecule, making it an example of a:
A.
Condensation (dehydration) reaction, releasing a molecule of water
B.
Addition reaction, with no loss of any small molecule
C.
Hydrolysis reaction, absorbing a molecule of water
D.
Substitution reaction involving halogen exchange
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ANSWER :
A. Condensation (dehydration) reaction, releasing a molecule of water
14.
The peptide bond is chemically classified as which type of functional linkage?
A.
An ester linkage (-CO-O-)
B.
An amide linkage (-CO-NH-)
C.
A disulfide linkage (-S-S-)
D.
An ether linkage (-O-)
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ANSWER :
B. An amide linkage (-CO-NH-)
15.
A molecule formed by the linkage of exactly two amino acids through a single peptide bond is called a:
A.
Polypeptide
B.
Monopeptide
C.
Tripeptide
D.
Dipeptide
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ANSWER :
D. Dipeptide
16.
A molecule formed by the linkage of three amino acids through two peptide bonds is called a:
A.
Oligonucleotide
B.
Polypeptide
C.
Dipeptide
D.
Tripeptide
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ANSWER :
D. Tripeptide
17.
When a large number of amino acid molecules are joined together by peptide bonds to form a long chain, the resulting molecule is called a:
A.
Polypeptide
B.
Monosaccharide
C.
Nucleotide
D.
Fatty acid
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ANSWER :
A. Polypeptide
18.
Proteins are essentially large biomolecules composed of one or more:
A.
Nucleotide sequences
B.
Polypeptide chains
C.
Monosaccharide units
D.
Fatty acid chains
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ANSWER :
B. Polypeptide chains