In presence of oxygen, how many additional molecules of ATP can be formed by metabolizing pyruvate and NADH in the mitochondria?

Out of 38 ATP molecules produced per glucose, 32 ATP molecules are molecules are formed from NADH/FADH₂ in

A

Respiratory chain

B

Krebs cycle

C

Oxidative decarboxylation

D

EMP

Which of the following are true with regard to anaerobic respiration in bacteria?
P. The final electron acceptor is an inorganic substance other than molecular oxygen.
Q. The number of ATP molecules produced per glucose molecule is more than that produced in aerobic respiration.
R. The number of ATP molecules produced per glucose molecule is less than that produced in aerobic respiration.
S. Only substrate level phosphorylation is used to generate ATP.

A

P and S only

B

Q and S only

C

P and R only

D

P, Q and S only

This process leads to the net production of two pyruvate, two ATP, and two NADH.

A

Glycolysis

B

Chemiosmosis

C

Fermentation

D

Calvin cycle

Consider the following statements regarding mitochondria and choose the correct answer:
1. Mitochondria are present in all cells which respire aerobically
2. They are absent in bacteria, where the plasma membrane has respiratory enzymes
3. Cells with high metabolic activity have a high number of mitochondria

A

Only 1 and 2 are correct

B

Only 2 and 3 are correct

C

Only 3 is correct

D

1, 2 and 3 are correct

Statement I Two ATP molecules are produced during anaerobic respiration.
Statement II Glucose is converted into pyruvic acid through a series of reaction with a net gain of 2 ATP molecules.

A

Both the statements are individually true and the statement II is the correct explanation of the statement I

B

Both the statements are individually true, but the statement II is not correct explanation of the statement I

C

The statement I is true, but the statement II is false

D

The statement I is false, but the statement II is true

Batch fermentation of glucose to ethanol yields a productivity of 4.5 g^-1L h^-1. If the yeast cell concentration in the fermentation broth is 5% (v/v) and the intracellular NAD⁺/NADH concentration in the yeast cells is 10 μM, the cycling rate of NAD⁺ ⇌ NADH will be

A

50,000 cycles h^-1

B

20,000 cycles h^-1

C

100 cycles h^-1

D

None of the above

In a well aerated and agitated microbial culture, the 'supply' of oxygen is equal to 'demand' (uptake) of the growing culture. The K_La for such a system will be (K_La = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen, C = instantaneous value of dissolved oxygen concentration, 'r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)

A

$$\frac{{\left( {rX} \right)}}{{\left( {C* - C} \right)}}$$

B

$$\frac{{\left( r \right)}}{{X\left( {C* - C} \right)}}$$

C

$$\frac{{\left( {C* - C} \right)}}{{\left( {rX} \right)}}$$

D

$$\frac{{\left( X \right)}}{{r\left( {C* - C} \right)}}$$

Which of the following is not an inhibitor of pyruvate dehydrogenase in conversion pyruvate to acetyl CoA?

A

Citrate

B

ATP

C

NADH

D

Acetyl CoA

If mitochondria were blocked at the site of NADH oxidation and were treated with succinate as substrate, what would the P : O ratio is?

A

Same as that normally produced by succinate

B

One more than normally produced by succinate

C

One less than normally produced by succinate

D

Zero

Mitochondria are not able to transport NADH from cytosol.

A

True

B

False

In presence of oxygen, how many additional molecules of ATP can be formed by metabolizing pyruvate and NADH in the mitochondria?

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