BIOL 2905 Chapter 9.12: Oxidative phosphorylation vs Chemiosmosis

29 views2 pages

lavendershark790

26 Oct 2017

School

York University

Department

Biology

Course

BIOL 2905

Professor

Dasantila Golemi- Kotra

For unlimited access to Textbook Notes, a Class+ subscription is required.

Document Summary

Che(cid:373)ios(cid:373)osis: atp synthase: its an enzyme located in the inner membrane. Its function is to synthesis atp from adp & pi. This is made possible from the gradient of protons which cross the intermembrane space into the matrix: oxidative phosphorylation: formation of atp via chemiosmosis during cellular respiration. An electrochemical gradient of protons (h+) across inner. It allows protons to move pass membrane & uses kinetic energy to phosphorylate atp, making atp: chemiosmosis: movement of ions across a semipermeable membrane, down their electrochemical gradient. Results in the generation of atp: proton motive force: it is the result of the electrochemical gradient creates across the inner membrane. It is generated by etc which acts as a proton pump using energy of electron from electron carrier to pump protons. This is the force that promotes the movement of protons across the membrane downhill the electrochemical gradient: lactate fermentation: it"s the process of producing atp in the absence of oxygen through glycolysis alone.

Related Questions

Oxidative phosphorylation is the final stage of cellular respiration and the main pathway of aerobic energy generation from glucose. Which of the following statements is NOT true?

a. NADH and FADH2 are used as âinputâ into the electron transport chain

b. The electron transport chain produces a proton gradient across the inner mitochondrial membrane

c. FADH2 stores less energy than NADH

d. The electron transport chain is made up of several membrane protein complexes

e. ATP synthesis by chemiosmosis requires about 30 protons per ATP molecule

1. Compared to the generation of ATP by oxidative phosphorylation, what is a major difference in mechanism of ATP generation by substrate-level phosphorylation in glycolysis?

A. A proton gradient is not involved

B. The ATP produced has less energy content because oxygen was not involved.

C. Substrate level phosphorylation occurs in the inter-mitochondrial space

D. One can't generalize without knowing the substrate.

2. Which of the following statements is true?

A. Because the electrons in NADH are at a higher energy than the electrons in reduced ubiquinone, the NADH dehydrogenase complex can pump more protons than can the cytochrome b-c1 complex.

B.The pH in the mitochondrial matrix is higher than the pH in the intermembrane space.

C. The proton concentration gradient and the membrane potential across the inner mitochondrial membrane tend to work against each other in driving protons from the intermembrane space into the matrix.

D. The difference in proton concentration across the inner mitochondrial membrane has a much larger effect than the membrane potential on the total proton-motive force.

According to the chemiosmotic theory, an electrochemical proton gradient is used to synthesize ATP in mitochondria. The enzyme that does this is located on the inside of the mitochondrial membrane. The oxidation of carbohydrates and fats is used to pump protons outside the mitochondrial membrane until the steady-state membrane potential is -140 mV and the pH gradient âpH = 1.5. Inside the mitochondrion, pH = 7.0, [ATP] = 1 mM, [Pi] = 2.5 mM, [ADP] = 1 mM, and T = 298 K.

a) Howw much chemical potential is required to synthesize ATP inside mitochondria? Hint: here the question refers to the chemical potential difference between products and reactants = âG of the reaction ADP + Pi -> ATP.

b) How much free energy is made available by moving 1 mol of protons from the outside to the inside? Is this enough to drive ATP synthesis?

c) How many protons must be translocated per ATP synthesized?

violetyellowjacket662

BIOL 2905 Chapter 9.12: Oxidative phosphorylation vs Chemiosmosis

Document Summary

Get access

Related Documents

BIOL 2905 Chapter Notes - Chapter 9.4: P700, Plastoquinone, Photosystem I

BIOL 2905 Lecture Notes - Lecture 8: Pyruvic Acid, Phosphorylation, Glycolysis

Related Questions