Question

1. Which of the following acts as both a product of photosynthesis and a reactant in cellular respiration?

carbon dioxide

glucose

water

NADPH

2.

Which of the following is produced during the Krebs cycle?

FAD

pycuvate

reduced electron carriers

lactic acid

3.

Some metabolic poisons, like 2,4-dinitrophenol, act as uncouplers, separating the flow of electrons from H⁺ ions, and thus preventing them from being concentrated. An uncoupler of oxidative phosphorylation would most likely lead to an increase in all of the following EXCEPT

ATP synthesis

heat produced by mitochondria

oxygen

NAD+

Answer 1

3) Ans-: (A) ATP synthesis

2,4-dinitrophenol (DNP) is a uncoupling agent uncouple oxidation from phosphorylation. They Allow the oxidation of N A D H and FADH2 and reduction of O2 to continue at high level but do not permit ATP synthesis. DNP is a weak acid that is soluble in lipid bilayer both in their protonated neutral form and in there and an anionic state . DNP in anionic state pickup Proton in the intermembrane space and diffuse readily across mitochondrial membrane after entering the matrix in the protonated form they can release a Proton the dissipating the proton gradient and inhibiting ATP synthesis the energy released by the oxidation of NADH in the presence of DNP is converted to heat.