Biomolecules  MCQs

MCQs of Biomolecules

Showing 121 to 130 out of 161 Questions
10 11 12 13 14 15
121.
What is main source of keratin ?
(a) Muscles
(b) Wool
(c) Hair
(d) Both (B) and (C)
Answer:

Option (d)

122.
By which bond, the polypeptide chains are joined in tertiary structure of protein ? (P) van der Waal's attraction (Q) H- bond (R) Ionic bond (S) Disulphide bond
(a) (P), (Q) and (S)
(b) Only (Q)
(c) (P), (Q), (R), and (S)
(d) (P) And (Q)
Answer:

Option (c)

123.
By which type secondary structure of protein can be shown ?
(a) α–helix
(b) β–pleated sheet
(c) γ–zigzag
(d) Both (A) and (B)
Answer:

Option (d)

124.
In α–helix shaped protein, polypeptide chain is coiled in _____ shape.
(a) spherical
(b) parallel
(c) helix
(d) coil
Answer:

Option (c)

125.
Approximate _____ amino acids are included per turn of the helix in α–helix shaped protein.
(a) 2 to 3
(b) 3 to 6
(c) 6 to 10
(d) 10 to 20
Answer:

Option (b)

126.
In β–pleated sheet shaped protein, one peptide chain forms intermolecular _____ bond with adjacent polypeptide chain.
(a) intramolecular hydrogen
(b) intermolecular
(c) ionic
(d) co-ordinate covalent
Answer:

Option (b)

127.
What is the effect of denaturation on proteins ?
(a) Biological activity increases.
(b) Loses their biological activity.
(c) Solubility of protein is increases.
(d) All of the above
Answer:

Option (b)

128.
Most globular proteins become denatured when heated above _____ temperature.
(a) 323 - 333 k
(b) 273 -323 k
(c) 293 - 313 k
(d) 473 - 573 k
Answer:

Option (a)

129.
Mention use of trichloro acetic acid ?
(a) For water softening.
(b) As anaesthetic during operation.
(c) To extinguish fire in fire extinguisher.
(d) In clinical chemistry tests.
Answer:

Option (d)

130.
How many times enzymes can increases the rate of reaction ?
(a) 102
(b) 1025
(c) 1012
(d) 10-8
Answer:

Option (c)

Showing 121 to 130 out of 161 Questions
10 11 12 13 14 15