Question 12:The activity of the following enzymes is
affected by biotin deficiency ?
A) Transketolase
B) Dehydrogenase
C) Oxidase
D) Carboxylase
Ans:D
Question 13:Replication and transcription are similar
processes in mechanistic terms because both ?
A) Use RNA primers for initiation
B) Use dexoyribonucleotides as precursors
C) Are semiconserved events
D) Involve phosphodiester bond formation with elongation
occuring in 5'-3' direction
Ans:B
Question 14:Km of an enzyme is ?
A) Dissociation constant
B) The normal physiological substrate concentration
C) The substrate concentration at half maximal velocity
D) Numerically identical for all isoenzymes that catalyze a
given reaction
Ans:C
Question 15:Dystrophic gene mutation leads to ?
A) Myasthenia gravis
B) Motor neuron disease
C) Poliomyelitis
D) Duchenne Muscular Dystrophy
Ans:D
Question 16:Cholesterol present in LDL ?
A) Represents primarily cholesterol that is being removed
from peripheral cells
B) Binds to a receptor and diffuses across the cell membrane
C) On accumulation in the cell inhibits replenishment of LDL
receptors
D) When enters a cell, suppresses activity of acyl-CoA:
cholesterol acyltransferase ACAT
Ans:B
Question 17:Acetyl Co-A acts as a substrate for all the
enzymes except ?
A) HMG-CoA synthase
B) Malic enzyme
C) Malonyl CoA synthetase
D) Fatty acid synthetase
Ans:B
