BIOL 1000 Chapter Notes - Chapter 8: Chemiosmosis, Conformational Change, Infor

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26 Aug 2018

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Series of integral membrane proteins, located in the inner membrane of a mitochondrion. Involved in transferring protons (h+ ) from the matrix to the intermembrane space. Creating/maintaining the proton concentration gradient no atp looooooooooool. Electrons from nadh and fadh2 are transported through the series of membrane bound proteins, to fuel the transfer of protons (h+ ) from the matrix to the intermembrane space. Water is by product and remember o2 is final e acceptor. Proton motive force and chemiosmosis: proton motive force = (source of energy) potential energy due to concentration gradient (ph) of protons and the charge gradient (voltage) across the membrane. Supplying energy for chemiosmosis: chemiosmosis = (mechanism that benefits from energy) harnessing the energy present in the proton gradient to drive chemical reactions (atp formation) Chemiosmosis and atp synthesis ---atp synthase catalyzes oxidative phosphorylation. H+ gradient across the membrane (chemiosmosis: atp synthase embedded in inner mitochondrial membrane.

Related Questions

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.

1.) Certain complexes of the mitochondrial electron transport chain pump protons. Which of the following BEST describes the movement of protons in this situation?

a.) across the outer mitochondrial membrane, from the cytoplasm to the intermembrane space

b.) across the outer mitochondrial membrane, from the intermembrane space to the cytoplasm

c.) across the inner mitochondrial membrane, from the intermembrane space to the matrix

d.) across the inner mitochondrial membrane, from the matrix to the inter membrane space

2.) Which regulatory mechanism is activated when the overall energy availability of a cell is high?

a.) Citrate inhibits phosphofructokinase-1.

b.) ADP up-regulates phosphofructokinase-1.

c.) ATP inhibits phosphofructokinase-1.

d.) AMP up-regulates phosphofructokinase-1.

3.) Electron carriers are oxidized during which of the following reactions?

a.) glycolysis

b.) citric acid cycle

c.) electron transport chain

d.) the conversion of pyruvate to acetyl coA

e.) all of the above

purpleswan410

use the following words: protons, NADH, electron gradient, ADP, FADH2, ATP, ATPsynthase, water, proton gradient, electrons

A molecule generated in both glycolysis and Krebs cycle, called ____________ , donates ____________ to the first protein in the electron transport chain.

At the same time, a molecule generated only in the Krebs cycle, called ____________ , donates ____________ to the second protein in the electron transport chain.

As the ____________ move through the transport chain, ____________ move through membrane proteins from the matrix to the intermembrane compartment.

At the end of the electron transport chain, ____________ bind to oxygen, forming ____________ .

The electron transport chain creates a(n) ____________ , which dissipates through an enzyme called ____________ .

As ____________ move through this enzyme, phosphate is added to ____________ , forming ____________ .

BIOL 1000 Chapter Notes - Chapter 8: Chemiosmosis, Conformational Change, Infor

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