9th class Biology
Chapter 6
Enzymes
Exercise solved Mcqs
1. What is true
about enzymes?
a)
They make biochemical reactions to proceed
spontaneously
b)
They lower the activation energy of a
reaction
c)
They are not very specific in their choice of
substrates
d)
They are needed in large quantities
2. To what category
of molecules to enzymes belong?
a)
Carbohydrates
b)
Lipids
c)
Nucleic acids
d)
Proteins
3. What is
true about cofactors?
a)
Break hydrogen bond in protein
b)
Help facilitate enzymes activity
c)
Increase activation energy
d)
Are composed of proteins
4.
Prosthetic groups are;
a)
Required by all enzymes
b)
Loosely attached with enzymes
c)
Proteins in nature
d)
Tightly bound to enzyme
5. When we
add more substrate to an already occurring enzymatic reaction and there is no
increase in the rate of reaction, what would you predict?
a)
All active site have been occupied by
substrate molecules
b)
The enzyme molecules have denature
c)
More substrate acted as inhibitor
d)
More substrate has distributed the pH of the medium
9th class Biology
Chapter 7
Bioenergetics
Exercise solved Mcqs
1. 1. Which of the
following steps of respiration, CO2 is produced?
a. Glycolysis
- Krebs cycle
- Electron transport chain
- All of these
2. 2. Oxygen takes
part in aerobic respiration in;
a)
Glycolysis
b)
Link step between Glycolysis and Krebs cycle
c)
Krebs cycle
d)
Electron transport chain
3. When a plant was kept in darkness for many
days its leaves turned yellow. why?
a)
Leaves could not get oxygen and so there was no
photosynthesis
b)
Leaves could not get light and so there was no
respiration
c)
Leaves could not get oxygen and so there was no
respiration
d)
Leaves could not get light and so there was
no photosynthesis
4.From which Bonds of ATP
molecule energy is taken?
a)
P-P bonds
b) C-H bonds
c) C-N bonds
d) C-O bonds
5. In which component of
leaf cells, chlorophyll is present?
a) Stroma
b)
Thylakoids
c) Plasma membrane
d) cytoplasm
6. 6. Which of these can
enter into krebs cycle?
a) Glucose
b) Pyruvic acid
c) Citric acid
d)
Acetyl Co-A
7. 7. When we work hard we
suffer from muscle fatigue because muscle cells;
a) Carry out aerobic respiration at faster rate and so are
tired
b) Carry out anaerobic respiration and so accumulate more
CO2
c)
Carry out anaerobic respiration and so
accumulate lactic acid
d) Carry out aerobic respiration and so accumulate lactic
acid
8. 8. Who many molecules of
CO2 produced when krebs cycle operated once?
a)
01
b) 02
c)
03
d)
04
9. 9. In which of the
following metabolic processes, oxidation as well as reduction of molecule
occur?
a) Photosynthesis
b) Respiration
c) Both
d) None of these
10. Chlorophyll pigment absorb maximum light in wavelengths
of;
a) Green and blue
b) Green and red
c) Green only
d) Red
and blue
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