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

Organic Chemistry - Biomolecules

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


7.
Amino acids that cannot be synthesized in adequate amounts by the human body and must therefore be obtained through the diet are called:
A.
Essential amino acids
B.
Neutral amino acids
C.
Non-essential amino acids
D.
Synthetic amino acids
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ANSWER :
A. Essential amino acids
8.
Amino acids that can be synthesized by the human body itself and therefore do not need to be obtained from external dietary sources are called:
A.
Essential amino acids
B.
Acidic amino acids
C.
Aromatic amino acids
D.
Non-essential amino acids
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ANSWER :
D. Non-essential amino acids
9.
In aqueous solution, amino acids exist predominantly as dipolar ions, in which the carboxyl group loses a proton and the amino group gains a proton. This dipolar ionic form is called a:
A.
Cation only
B.
Free radical
C.
Zwitterion
D.
Anion only
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ANSWER :
C. Zwitterion
10.
Since amino acids can act as both an acid (donating a proton from -COOH) and a base (accepting a proton at -NHâ‚‚), they are described as being:
A.
Completely neutral, with no acid-base properties
B.
Amphoteric in nature
C.
Purely acidic in nature
D.
Purely basic in nature
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ANSWER :
B. Amphoteric in nature
11.
The specific pH at which an amino acid exists predominantly in its neutral zwitterionic form, carrying no net electric charge, is called its:
A.
Isoelectric point
B.
Melting point
C.
Boiling point
D.
Dissociation constant
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ANSWER :
A. Isoelectric point
12.
The chemical bond that links two amino acid molecules together, formed by the reaction between the carboxyl group of one amino acid and the amino group of another, is called a:
A.
Hydrogen bond
B.
Phosphodiester bond
C.
Peptide bond (amide linkage)
D.
Glycosidic bond
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ANSWER :
C. Peptide bond (amide linkage)