(a) they always increase rate of reaction
(b) they always decrease rate of reaction
(c) they do not disturb the equilibrium
(d) Always carry irreversible reactions
42. Linkage present in cellulose molecule is
(a) b (1 -> 4) (b) a ( 1 -> 4)
(c) a (1 ->6) (d) both (b)and (c)
43. Blocking action of enzyme through blocking its active site is
(a) Allosteric inhibition (b) Feedback inhibition
(c) Competitive inhibition (d) Non-competitive inhibition
44. Which one of the following is without coenzyme activity ?
(a) Vitamin E (b) Thiamine
(c) Biotin (d) Riboflavin
45. Active transport
(a) Releases energy (b) Require energy
(c) Produces energy (d) Produces toxic material
46. A short length of double stranded DNA molecule contains 120 adenine and 120 cytosine
bases. The total number of nucleotides in this DNA fragment is
(a) 60 (b) 120
(c) 240 (d) 480
47. Which of the following element plays an important role in nitrogen fixation?
(a) Manganese (b) Molybdenum
(c) Zinc (d) Copper
48. Specificity of an enzyme depends upon
(a) Active site (b) Linear sequence
(c) Km (d) Turn over number
49. Sodium Dodecyl Sulphate (SDS) is used while separating proteins by polyacrylanide
gel electrophoresis because
(a) It helps in solubilization of proteins thereby making it easier to separate
(b) It binds to proteins and confers uniform negative charge density thereby making
them move during electrophoresis
(c) Decreases the surface tension of the buffer used for electrophoresis
(d) Stabilizes the proteins
50. In a substitution nucleophilic first order reaction (SN1)the stereochemical outcome is
(a) Raemisation (b) Inversion of configuration
(c) Retention of configuration (d) Difficult to predict
Check Your answer
