Questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : In alcoholic fermentation, the hexose molecule is converted into glucose and fructose.
Statement 2:Alcoholic fermentation is anaerobic respiration brought about by enzyme zymase.

Statement- 1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement -1
Statement -1 is True, Statement -2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement- 2 is False
Both the statements are False

Solution

Alcoholic fermentation is the respiration in absence of O₂. In this process, hexose molecule is changed to ethylalcohol and CO₂. In presence of zymase enzyme. In this less amount of energy is released as compared to aerobic respiration.

Questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : The product of the first reaction of the Kreb’s cycle is citric acid, a six carbon compound.
Statement 2 : The first reaction of the Kreb’s cycle is the condensation of acetyl CoA with oxaloacetate.

Statement- 1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement -1
Statement -1 is True, Statement -2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement- 2 is False
Both the statements are False

Solution

The first reaction of the Krebs cycle is the condensation of acetyl CoA (2 C compound) with oxaloacetate(4 C compound). Citric acid, a 6 carbon-compound is the first product of Krebs cycle.

R.Q. in anaerobic respiration is

zero
∞
1
1

Solution

During anaerobic respiration, due to the absence of O₂ the value of R.Q.is infinite (or more than one).

In animal cells, the first stage of glucose breakdown is

Krebs cycle
glycolysis
oxidative phosphorylation
electron transport chain

The R.Q. value of Oxalic acid is

If R. Q. is less than 1.0 in a respiratory metabolism, it would mean that

Carbohydrates are used as respiratory substrate
Organic acids are used as respiratory substrate
The oxidation of the respiratory substrate consumed more oxygen than the amount of CO₂ released
The oxidation of the respiratory substrate consumed less oxygen than the amount of CO₂ released

R.Q. for glucose (Carbohydrates) is

1
0.5
2
0.05

Solution

Which of the following pair is a combination of lowest and highest energy molecules ?

Glucose and pyruvic acid
Acetyl CoA and palmitic acid
Glucose and malic acid
Malic acid and acetyl CoA

Which of the following is necessary for respiration in plants ?

Carbon dioxide
Oxygen
Chlorophyll
Light

RQ (respiratory quotient) is defined as

Volume of CO₂ evolved = volume of O₂ consumed
\(\frac{Volume\, of\, O_{2} consumed}{Volume\, of\, CO_{2}\, evolved}\)
\(\frac{Volume\, of\, CO_{2}\, evolved}{Volume\, of\, O_{2}\, consumed}\)
\(\frac{Volume\, of\, O_{2}\, evolved}{Volume\, of\, CO_{2}\, consumed}\)

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