The energy released by oxidation of respiratory substrates:
A.
Comes out in a single step to increase the possibility of maximum ATP production
B.
is not used directly
C.
is used directly in the energy requiring processes of the organisms
D.
Is trapped as chemical energy in the energy currency of the cell
(a)
C and D are incorrect
(b)
B and D are correct
(c)
A and B are correct
(d)
A and D are incorrect
2.
How many ATP molecules and during which steps, are directly synthesized in EMP pathway
from one glucose molecule?
(a)
4 ATP, 2 in each PEP to pyruvic acid and BiPGA to PGA
(b)
2 ATP, 1 in each PEP to pyruvic acid and BiPGA to PGA
(c)
2 ATP, 1 in each Glucose to Glucose-6-P and Fructose-6-P to Fructose 1, 6 BiP
(d)
4 ATP, 2 in each Glucose to Glucose-6-P and Fructose-6-P to Fructose 1, 6 BiP
3.
Which of the following enzyme(s) is/are involved in the conversion of pyruvic acid into CO2
and ethanol?
(a)
Pyruvic acid dehydrogenase
(b)
Alcohol decarboxylase
(c)
Both (a) and (b)
(d)
Pyruvic acid decarboxylase
4.
The complete oxidation of one molecule of pyruvate by the stepwise removal of all the hydrogen
atoms
(a)
leaving six molecules of CO2
(b)
leaving two molecules of CO2
(c)
leaving four molecules of CO2
(d)
leaving three molecules of CO2
5.
In aerobic respiration, the ultimate or final electron acceptor is
(a)
Atomic oxygen
(b)
Molecular oxygen
(c)
Cytochrome a3
(d)
Water
6.
Fermentation is differ from aerobic respiration
(a)
in having partial breakdown of glucose
(b)
in producing less ATP per glucose
(c)
in having slow oxidation of NADH2 to NAD+
(d)
All of the above
7.
Complete oxidation of which of the following respiratory substrate evolved less volume of CO2
as compare to volume of O2 consumed?
(a)
Fats
(b)
Proteins
(c)
Carbohydrates
(d)
Both (1) and (2)
8.
Enzymes are differ from inorganic catalysts because enzymes get damaged at high temperatures.
This difference
(a)
is applicable to all enzymes
(b)
is not applicable to thermolabile enzymes
(c)
is not applicable to the enzymes of thermophilic organisms
(d)
is applicable to thermostable enzymes
Answers
Explanation:
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Answer:
The correct options are d, c, c, d, a, d, a, a
Explanation:
1. The energy released by the oxidation of respiratory substrates: d. A and D are incorrect.
2. C. 2 ATP, in each glucose to glucose -6-P and Fructose-6-P to Fructose 1,6 BiP.
3. c. both a and b i.e. pyruvic acid dehydrogenase and alcohol decarboxylase.
Pyruvic acid dehydrogenase converts pyruvate into acetaldehyde with the release of CO2 and alcohol decarboxylase converts it into Ethanol.
4. d. i.e. leaving three molecules of CO2, at the time of complete oxidation three molecules of CO2 are released.
5. a. Atomic oxygen because the NADH and FDH2 are converted to ATP with oxygen as the final elector acceptor.
6. d. all of the above
7. a. fats because when B oxidation of fatty acid takes place to form acetyl Co-A there are no CO2 molecules generated, therefore less volume of CO2 is generated as compared to the volume of O2.
8. a. This difference is applicable to all enzymes.