Which of the following statements best describes the role or activity of an oxidoreductase? it catalyses a reaction where phosphates are moved from one molecule to another it changes an endergonic reaction into an exergonic one it catalyses a reaction where electrons are moved from one molecule to another it changes an exergonic reaction into an endergonic one

Which of the following statements is TRUE? 0 Pyruvate is oxidized to lactate in fermentation pathways, creating NADH O The oxidation of one molecule is always coupled to the reduction of a second molecule. 0 Glycolysis is a self-sustaining pathway that runs without input form other pathways 0 Organic molecules with lots of 0-H bonds are more oxidized than those with less C-H bonds. 0 None of the Above

The synthetic toxin 2.4-dinitrophenol can uncouple ATP synthesis from mitochondrial respiration by increasing the permeability of the inner membrane to protons. What would be the effect of dinitrophenol treatment on the amount of ATP produced by mitochondria, and the rate of 02 consumption by the ETC, respectively? 0 no difference; negative 0 negative; no difference 0 negative; negative 0 positive; no differenoe 0 positive; positive

1)The role or the activity of the oxidoreductase-is that it catalyzes the reaction where electrons are moved from one molecule to another. This is because the oxidoreductase is an enzyme that catalyzes the transfer of the electrons from the one molecule which is the reductant which is also known as electron donor.

To another the oxidant is also known as electron acceptor.

This group of the enzymes routinely utilizes NADP or NAD⁺ as cofactors.

2)The oxidation of one molecule is always coupled to a reduction of a second molecule-This reaction is always in pair .This is whereby when substance gets oxidized ,the other agent gains those electrons, acting as the oxidizing agent and hence gets reduced in the process.

3)Positive, Positive-2,4-dinitrophenol and acidic aromatic compounds carry protons across the inner mitochondrial membrane, when uncouplers are present, electrons are transmitted from NADH to O₂ in a normal fashion but ATP(Adenosine Triphosphate)is not formed by mitochondrial ATP because the proton motive force across the inner mitochondrial membrane is given out.

The loss of respiratory control leads to an increase in oxygen consumption and oxidation of NADH.

Incase of accidental injection of uncouplers huge amounts of metabolic fuels are consumed but there is No energy stored as ATP.

The energy is released as heat.

Step-by-step explanation

Oxidoreductase is an enzyme that catalyzes a redox reaction. which is oxidation and reduction.

An enzyme is a globular protein which catalyzes a biological chemical reaction.

Oxidation is the process of gaining oxygen while reduction is the process of losing oxygen. This Redox takes place due to the transferring of oxygen.

Oxidizing agent is the one which gives oxygen to another element while Reducing agent is one which takes oxygen from another element.

2,4-Dinitrophenol is an organic compound. It is a yellow, crystalline solid that has a sweet ,musty odor.

It is soluble in organic solvents as well as aqueous alkaline solutions.

It sublimes is volatile with steam and is insoluble in most organic solvents.

It is a precursor to other chemicals and is biochemically active, hence inhibiting adenosine triphosphate is being produced in cells with mitochondria.