BIOCHEMISTRY (LOOSELEAF)-W/ACCESS
9th Edition
ISBN: 9781319425784
Author: BERG
Publisher: Macmillan Higher Education
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Chapter 19, Problem 14P
Interpretation Introduction
Interpretation:
The ultimate electron acceptor and donor in photosynthesis and the force driving electron flow between the donor and the acceptor has to be explained.
Concept introduction:
In general the photoelectron transfermechanism in photosynthesis comprises of two light reactions, i.e.,light reaction I and light reaction II, which occur during electron transferthrough Photosystem II and Photosystem I respectively.
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Chemiosmosis. ATP synthesis in chloroplasts is usually light dependent; it does not happen in the dark.
When researchers shifted isolated chloroplasts from a low pH solution to a more alkaline (higher pH) solution, ATP synthesis occurred even in the absence of light! This was an experiment used to support the chemiosmosis mechanism of ATP formation in chloroplasts. Why?
What would happen if the isolated chloroplasts were shifted to a lower pH solution?
What would be the results if the above experiments were performed in the presence of light?
If these experiments were performed in mitochondria instead of chloroplasts, what results would we expect?
Chemical energy.
The diagram below shows a metabolic pathway that occurs in chloroplasts during
photosynthesis.
ribulose bisphosphate (RuBP)
ADP + P₁
carbon dioxide (CO₂)
1
X
HINEW
ribulose-1,5-bisphosphate
carboxylase-oxygenase
(RuBisCo)
glucose
triose
phosphate
(TP)
State two features of metabolic pathways?
two key features of metabolic pathways
glycerate-3-phosphate (GP)
are their
-X
ADP + P₁
interconnectedne
Fo-F1 ATPase. The energy for ATP synthesis from ADP and Pi is provided by the downhill transport of protons through the rotary FoF1 ATP synthase (lecture 22). The enzyme has 3 a-b and 12 ‘c’ subunits. The mitochondrion maintains Df=180 mV (negative inside), pHin = 8, pHout=7, [Pi] = 3 mM and ADP is present as well.
How much energy is available (from the proton electrochemical gradient) for ATP synthesis under these conditions (in kJ/mol)?
What [ATP]/[ADP] ratio will be established at steady-state under these conditions?
What would be the [ATP]/[ADP] ratio if the enzyme had only 9 ‘c’ subunits? Remember that full revolution of the crank (gamma subunit) produces 3 ATP.
Chapter 19 Solutions
BIOCHEMISTRY (LOOSELEAF)-W/ACCESS
Ch. 19 - Prob. 1PCh. 19 - Prob. 2PCh. 19 - Prob. 3PCh. 19 - Prob. 4PCh. 19 - Prob. 5PCh. 19 - Prob. 6PCh. 19 - Prob. 7PCh. 19 - Prob. 8PCh. 19 - Prob. 9PCh. 19 - Prob. 10P
Ch. 19 - Prob. 11PCh. 19 - Prob. 12PCh. 19 - Prob. 13PCh. 19 - Prob. 14PCh. 19 - Prob. 15PCh. 19 - Prob. 16PCh. 19 - Prob. 17PCh. 19 - Prob. 18PCh. 19 - Prob. 19PCh. 19 - Prob. 20PCh. 19 - Prob. 21PCh. 19 - Prob. 22PCh. 19 - Prob. 23PCh. 19 - Prob. 24PCh. 19 - Prob. 25PCh. 19 - Prob. 26PCh. 19 - Prob. 27PCh. 19 - Prob. 28PCh. 19 - Prob. 29PCh. 19 - Prob. 30PCh. 19 - Prob. 31P
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- please help with this question. I am stuck. I listed the graph below ! Exergonic reactions such as the breakdown of ATP, are said to be “spontaneous.” However, by themselves, even exergonic reactions often proceed very slowly. What part of the curve helps to explain this?arrow_forwardLife requires energy. Describe the basic principles of bioenergetics in an animal cell. How is the flow and transformation of energy different in a photosynthesizing cell? Include the role of ATP and enzymes in your discussion.arrow_forwardgoes. In order to summarize Cellular Respiration reactions, draw FIVE big boxes in a line down the middle of your page. Write 1) Glycolysis, 2) Pyruvate Oxidation, 3) Citric Acid Cycle, 4) Electron Transport Chain, and 5) Chemiosmosis inside these boxes. Below each process name write WHERE it occurs. Make arrows going in and out of each box. Write IN and OUT on top of the page above the arrows. Each box represent multistep processes. You are focusing on the INPUTS and OUTPUTS. A. First focus on the flow of ENERGY. For each box write the INPUT and OUTPUT – the molecule(s) or form that contain the potential energy. B. Next, in a different color of ink (or highlighter) focus on the flow of ELECTRONS. For each box write the molecule(s) that carry the electrons from which you are harnessing energy. C. And finally, in a third color of ink (or highlighter) focus on the flow of CARBON. For each box write the carbon molecule (if any) from which you are harnessing energy.arrow_forward
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Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY