Oxidative phosphorylation is production ofa)ATP in photosynthesis [1992]b)NADPH in photosynthesisc)ATP in respirationd)NADH in respirationCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Overview: oxidative phosphorylation

Simple diagram of the electron transport chain. The electron transport chain is a series of proteins embedded in the inner mitochondrial membrane.

In the matrix, NADH and FADH2 deposit their electrons in the chain (at the first and second complexes of the chain, respectively).

The energetically 'downhill' movement of electrons through the chain causes pumping of protons into the intermembrane space by the first, third, and fourth complexes.

Finally, the electrons are passed to oxygen, which accepts them along with protons to form water.

The proton gradient produced by proton pumping during the electron transport chain is used to synthesize ATP. Protons flow down their concentration gradient into the matrix through the membrane protein ATP synthase, causing it to spin (like a water wheel) and catalyze conversion of ADP to ATP.

The electron transport chain is a series of proteins and organic molecules found in the inner membrane of the mitochondria. Electrons are passed from one member of the transport chain to another in a series of redox reactions. Energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation. The key steps of this process, shown in simplified form in the diagram above.

Answer

In oxidative phosphorylation ATP production (8/6 ATP)

Answer

Formation of ATP from ADP in the presence of oxygen during the Krebs cycle is known as oxidative phosphorylation.
This takes place in mitochondria of the cell during oxidative phosphorylation a total of 28 ATP are formed.
So the correct option is 'ATP in respiration'

Answer

Oxidative phosphorylation is the process by which ATP (adenosine triphosphate) is produced during cellular respiration. It occurs in the mitochondria of eukaryotic cells and involves the transfer of electrons through a series of protein complexes embedded in the inner mitochondrial membrane. This transfer of electrons drives the synthesis of ATP.

The correct answer to the given question is option 'C', which states that oxidative phosphorylation is the production of ATP in respiration. We will now explain why this answer is correct.

Production of ATP in Respiration:
---------------------------------------------------
During cellular respiration, glucose is broken down in a series of metabolic reactions to produce energy in the form of ATP. This process occurs in several stages, including glycolysis, the Krebs cycle, and oxidative phosphorylation.

1. Glycolysis:
----------------
Glycolysis is the initial step in cellular respiration and occurs in the cytoplasm. In this process, glucose is converted into two molecules of pyruvate, generating a small amount of ATP and NADH (nicotinamide adenine dinucleotide). This step does not involve oxidative phosphorylation.

2. Krebs Cycle:
----------------
The pyruvate molecules produced in glycolysis enter the mitochondria and undergo further processing in the Krebs cycle (also known as the citric acid cycle or TCA cycle). Here, the pyruvate is fully oxidized, producing NADH and another molecule called FADH2 (flavin adenine dinucleotide). The Krebs cycle does not directly involve oxidative phosphorylation but provides the necessary electron carriers (NADH and FADH2) for the next step.

3. Oxidative Phosphorylation:
------------------------------
The final stage of cellular respiration is oxidative phosphorylation, which occurs in the inner mitochondrial membrane. This stage involves the transfer of electrons from NADH and FADH2 to a series of protein complexes called the electron transport chain (ETC).

The ETC consists of four protein complexes (I, II, III, and IV) that are embedded in the inner mitochondrial membrane. As electrons pass through these complexes, they are transferred from one molecule to another, releasing energy in the process.

This energy is used to pump protons (H+) from the mitochondrial matrix to the intermembrane space, creating an electrochemical gradient. The protons then flow back into the mitochondrial matrix through ATP synthase, a protein complex embedded in the inner membrane. This flow of protons drives the synthesis of ATP from ADP (adenosine diphosphate) and inorganic phosphate (Pi), a process known as chemiosmosis.

In summary, oxidative phosphorylation is the production of ATP in respiration. It occurs in the mitochondria and involves the transfer of electrons through the electron transport chain, which creates an electrochemical gradient used to generate ATP.

Similar NEET Doubts

In plant cells, synthesis of ATP by the chemiosmoticmechanism occurs during

C4 plants are more efficient in photosynthesis than C3 plants due to

The synthesis of ATP in photosynthesis and respiration is essentially a redox process involving removal of energy from 1.Oxygen 2.Phytochrome 3.Cytochrome 4.Electrons

Compensation point is the value of a factor where there is

Top Courses for NEETView all

Biology Class 11

Daily Test for NEET Preparation

NEET Mock Test Series 2025

Topic-wise MCQ Tests for NEET

Physics Class 11

Top Courses for NEET

Top Courses for NEET

Suggested Free Tests

Related Content

About NEET

NEET Preparation Material

How to Prepare for NEET Exam?

NCERT Based Study Material

NEET Mock Tests

Other Popular Exams

Company