Biology- 11 Chapter 3
Enzymes - 5
1.
The catalytic activity of an enzymes is restricted to its small portion called
a) active site
b) passive site
c) regulation site
d) allosteric site
2.
Which of the following has a coenzyme activity?
a) nicotinamide
b) purine
c) pyrimidine
d) alcohol
3.
Enzymes exist in the cells as
a) solid
b) crystals
c) solution
d) colloids
4.
Combination of apoenzyme and coenzyme produces
a) prosthetic group
b) holoenzyme
c) apoenzyme
d) isoenzyme
5.
The specificity of enzyme is due to their
a) surface configuration
b) pH
c) hydrogen bonding
d) high molecular weight
6.
An essential feature of a competitive inhibitor is its ability to
a) activate an operator gene
b) combine with prosthetic group
c) modify a substrate
d) occupy an active site
7.
The reaction rate of salivary amylase with starch decreases as the
concentration of chloride ions is reduced. Which of the following describe
the role of the chloride ions?
a) allosteric inhibitors
b) cofactors
c) coenzyme
d) competitive inhibitor
8.
How does an enzyme increase the rate of a reaction?
a) by bringing the reacting molecules into precise orientation
b) by increasing the rate of random collisions of molecules
c) by shifting the point of equilibrium of the reaction
d) by supplying the energy required to start the reaction
9.
Many enzymes are secreted in inactive form to protect
a) cell proteins
b) mitochondria
c) cell membrane
d) cell DNA
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