Assertion: Glucose is the favoured respiratory substrate.Reason:

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 Multiple Choice QuestionsMultiple Choice Questions

61.

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

  • Conversion of pyruvic acid to acetyl Co-A

  • Electron transport chain

  • Glycolysis

  • Krebs cycle


62.

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on 

  • proton gradient

  • accumulation of K ions

  • accumulation of Na ions

  • membrane potential


63.

Fat, prior to its oxidation associate with

  • cyclic AMP

  • Co- A

  • GMP

  • ATP


64.

The net gain ATP from complete oxidation of 1 molecule of glucose in eukaryote is

  • 2

  • 4

  • 24

  • 36


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65.

R.Q. is always less than one in

  • wheat

  • millets

  • bean

  • castor


66.

The terminal electron acceptor during electron transport system is

  • oxygen

  • cyto a3

  • cyto c

  • plasto quinone


67.

Glycolysis occurs in

  • cytosol

  • mitochondria

  • Golgi complex

  • ribosomes


68.

Assertion: Conversion of 1,3 biphosphoglycerate (BPGA) to 3-phospho-glyceric acid (PGA) is an energy yielding step.

Reason: This energy is trapped in the form of ATP

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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69.

Which enzyme helps in transfer of phosphate group from ATP to a carbohydrate

  • Phosphatase

  • ATPase

  • Phosphorylase

  • Catalase


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70.

Assertion: Glucose is the favoured respiratory substrate.

Reason: When glucose is used as respiratory substrate and is completely oxidized, the RQ is 1.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio.

RQ = Volume of CO2 evolved/ Volume of O2 consumed.

The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of CO2 and O2 are evolved and consumed respectively.

C6H12O6 +6O 6CO2 +6H2O+ Energy

   RQ = 6CO2/6O2 = 1


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