Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:### Electron Transport Chain in Thylakoid Membranes
**Instructions:**
a) **Label PSI and PSII.**
b) **Draw the path of the electron transport chain.**
**Diagram 6 Explanation:**
This diagram illustrates components of the electron transport chain located in the thylakoid membrane of the chloroplast. The structure visible in the diagram is a cross-section of the thylakoid with labels indicating the thylakoid stroma above the membrane and the thylakoid lumen below.
**Key Components:**
- **PSII (Photosystem II):** Typically located on the left side of the diagram (indicate in green).
- **PSI (Photosystem I):** Typically located on the right side of the diagram (also indicated in green).
**Additional Structures:**
- The diagram shows several protein complexes embedded within the thylakoid membrane. These complexes are involved in the transfer of electrons from water to NADP+, creating NADPH, while generating a proton gradient utilized to produce ATP.
**Understanding the Pathway:**
- **Electron Flow:** Electrons move from PSII through various carriers (in the membrane) before reaching PSI. This movement is essential for the synthesis of ATP and NADPH, energy-rich compounds used in the Calvin cycle for carbohydrate production.
This electron transport chain is crucial for photosynthesis, allowing plants to convert light energy into chemical energy.
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