21.

The terminal electron acceptor during electron transport system is

• oxygen

• cyto a₃

• cyto c

• plasto quinone

Glycolysis occurs in

• cytosol

• mitochondria

• Golgi complex

• ribosomes

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.

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

• Phosphatase

• ATPase

• Phosphorylase

• Catalase

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.

In aerobic respiration, total number of ATP molecules formed from 1 glucose molecule is

• 28

• 32

• 36

• 30

Which of the following cartoon characters does not share its name with that of a gene

• Tintin

• Popeye

• Asterix

• Obelix

After glycolysis, fate of glucose in mitochondrial matrix is

• oxidation

• reduction

• oxidative decarboxylation

• hydrolysis

The enzyme decarboxylase catalyses the following step

• conversion of citric acid to cis aconitic acid

• fumaric acid to malic acid

• oxalosuccinic acid to $\mathrm{\alpha }$- ketoglutaric acid

• malic acid to oxaloacetic acid

Which ofthe following is true regarding the given electron transport chain?

CoQ $\to$Cyt c $\to$Cyt aa₃ $\to$O₂

• CoQ $\to$Cyt c is H⁺ absorbing site

• aa₃ $\to$O₂, H⁺ yielding site

• CoQ $\to$Cyt c is H⁺ yielding site and aa₃ $\to$O₂ is H⁺ absorbing site

• No H⁺ is absorbed or released