Chemical Constituents of Living Cells : Biomolecules-Structure and Function of Proteins, Carbodydrates, Lipids, Nucleic Acids; Enzymes-types, Properties, Enzyme Action, Classification and Nomenclature of Anzymes NEET Questions

Biology - Cell Structure and Function

Chemical Constituents of Living Cells : Biomolecules-Structure and Function of Proteins, Carbodydrates, Lipids, Nucleic Acids; Enzymes-types, Properties, Enzyme Action, Classification and Nomenclature of Anzymes MCQ Questions


13.
An amino acid is called 'zwitterion' because:
A.
It has no charge
B.
It has two carboxyl groups
C.
It is colorless
D.
At a particular pH, it has both positive (-NH3+) and negative (-COO-) charges simultaneously
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ANSWER :
D. At a particular pH, it has both positive (-NH3+) and negative (-COO-) charges simultaneously
14.
Ionizable nature of amino acids means:
A.
Their structure changes with pH (different ionic states)
B.
They are always neutral
C.
They cannot conduct electricity
D.
They cannot form bonds
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ANSWER :
A. Their structure changes with pH (different ionic states)
15.
Essential amino acids are those that:
A.
Are not used in proteins
B.
Are made by the body
C.
Cannot be synthesized by the body and must be obtained from diet
D.
Are toxic
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ANSWER :
C. Cannot be synthesized by the body and must be obtained from diet
16.
Proteins are polymers of:
A.
Monosaccharides
B.
Fatty acids
C.
Amino acids
D.
Nucleotides
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ANSWER :
C. Amino acids
17.
Two amino acids are joined together by which type of bond?
A.
Phosphodiester bond
B.
Glycosidic bond
C.
Peptide bond
D.
Hydrogen bond
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ANSWER :
C. Peptide bond
18.
Peptide bond formation involves loss of:
A.
A molecule of NH3
B.
A molecule of methane
C.
A molecule of CO2
D.
A molecule of water
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ANSWER :
D. A molecule of water