Biomolecules NDA Questions

NDA BIOLOGY

Biomolecules MCQ Questions


13.
How many essential amino acids are required by humans?
A.
12
B.
20
C.
6
D.
9
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ANSWER :
D. 9
14.
The primary structure of a protein refers to:
A.
Sequence of amino acids in the polypeptide chain
B.
Arrangement of multiple polypeptide chains
C.
3D folding of the polypeptide chain
D.
α-helix and β-sheet formations
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ANSWER :
A. Sequence of amino acids in the polypeptide chain
15.
α-helix and β-pleated sheet are examples of which structural level of proteins?
A.
Primary structure
B.
Quaternary structure
C.
Secondary structure
D.
Tertiary structure
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ANSWER :
C. Secondary structure
16.
Which amino acid contains a sulfur-containing side chain that can form disulfide bonds?
A.
Tyrosine
B.
Tryptophan
C.
Methionine
D.
Cysteine
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ANSWER :
D. Cysteine
17.
Enzymes are chemically:
A.
Carbohydrates
B.
Nucleic acids
C.
Lipids
D.
Proteins
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ANSWER :
D. Proteins
18.
The term 'enzyme' was coined by:
A.
James Watson in 1953
B.
Wilhelm Kühne in 1877
C.
Louis Pasteur in 1850
D.
Linus Pauling in 1940
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ANSWER :
B. Wilhelm Kühne in 1877