Question

Following are certain statements with regard to plant respiration:

A. Metabolism of glucose into pyruvate through glycolysis generates NADH and not NADPH

B. Metabolism of glucose through oxidative pentose phosphate cycle does not produce NADPH

C. Cyanide forms a complex with haem iron of cytochrome oxidase leading to prevention of change in valency, which in turn stops electron transport in the respiratory chain

D. Alternative oxidase is insensitive to cyanide and has higher Km than that of cytochrome oxidase

Which one of the following combinations is correct?

• A. A, B and C
• B. B, C and D
• C. B and D
• D. A, C and D

Answer 1

The correct option is D A, C and D

In the metabolism of glucose by the process of glycolysis end product is pyruvate, ATP and NADP is also produced but not NADPH.

Metabolism of glucose through pentose phosphate pathway produces NADPH.

Cyanide acts an inhibitor in ETC, it forms a complex with Fe of cytochrome oxidase which stops electron transport.

Alternative oxidase have a higher affinity than cytochrome oxidase and it is insensitive to cyanide.