BIOL 1000 Lecture Notes - Lecture 28: Thylakoid, Light-Independent Reactions, Chemiosmosis

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erinchimpanzee657

13 May 2017

School

University of Manitoba

Department

Biological Sciences

Course

BIOL 1000

Professor

Kevin G.Scott

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Document Summary

Chemiosmosis is the method of atp formation in cellular respiration within the mitochondria . Potential energy of a concentration gradient of hydrogen ions (h+) across a membrane powers atp synthesis . Gradient is created when electron transport chain uses energy released as it passes electrons down the chain to pump h+ across a membrane . Electron transport chain for photosynthesis is located within the thylakoid membrane of a chloroplast . Photoexcited electrons pass down the electron transport chain that connects the 2 photosystems . Hydrogen ions are pumped across the membrane from the stroma in the thylakoid space . Energy of concentration gradient drives h+ back across the membrane through atp synthase . Couples the flow of h+ to the phosphorylation of adp. Light energy derives electrons that originally came from water, to top of transport chain . Chemiosmosis production of atp in photosynthesis is called photophosphorylation . Chloroplasts transform light energy into chemical energy of atp .

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

The electron transport chain of the light reactions is responsible for energy coupling. Which statement correctly describes the energy coupling that occurs here?

_____________________

__	The electrons will decrease in potential energy as they are passed along, and this will be used to power the active transport of hydrogen ions.

__	The reduction of oxygen at the bottom of the electron transport chain will release energy, and this will be used to synthesize ATP.

__	The conversion of NADP+ into NADPH will release energy, and this will be used to reduce carbon dioxide into glyceraldehyde-3-phosphate.

__	The facilitated diffusion of water across the thylakoid membrane will release energy, and this will be used to generate an electrochemical gradient of electrons.

When electrons are passed down the electron transport chain in the mitochondria during respiration (or in the chloroplast during photosystem II), the series of redox reactions that carry the electrons along gradually lose energy. Where does this energy go? It isâ¦

a)lost as heat.

b)used to move protons (H+) across a membrane, against their concentration gradient.

c)used to make NADH in mitochondria or NADPH in chloroplasts.

d)used to split water into hydrogen and oxygen.

I believe the answer is D but I'm not sure

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BIOL 1000 Lecture Notes - Lecture 28: Thylakoid, Light-Independent Reactions, Chemiosmosis

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