Activity of the light reactions (ETC) can be assayed using an artificial, reducible compound (e- acceptor) added to take the place of the terminal electron acceptor. The artificial e- acceptor used is called DCPIP, a blue dye that turns colorless when it accepts electrons. The reaction is:H2O + DCPIPoxidized (blue) --> O2 + DCPIPreduced (colorless)What molecule from the light reactions of photosynthesis does DCPIP compete with? NADPH H2O ATP ADP NADP+

Photosynthesis is the process of synthesis of food in the form of glucose by utilising sunlight, carbon dioxide and water. The light dependent phase is one of the phase of photosynthesis. The photosystem 2 utilises energy from the sunlight and breaks down water in to electron, proton and oxygen. The oxygen is released from chloroplast. The protons are accumulated in the thylakoid lumen. The electrons are transported across the electron transportation chain. The electrons are transported to the photosystem 1. The NADP+ is reduced to NADPH. When DCPIP is used in the experiment, then DCPIP competes with the NADP+ for uptaking of electrons from photosystem 1. The reduced form of DCPIP is colorless. Whereas the oxidised form of DCPIP has blue color. Answer) NADP+

Answered: Activity of the light reactions (ETC)…

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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Activity of the light reactions (ETC) can be assayed using an artificial, reducible compound (e- acceptor) added to take the place of the terminal electron acceptor. The artificial e- acceptor used is called DCPIP, a blue dye that turns colorless when it accepts electrons. The reaction is:

H₂O + DCPIP_oxidized _(blue) --> O₂ + DCPIP_reduced _(colorless)

What molecule from the light reactions of photosynthesis does DCPIP compete with?

NADPH

H2O

ATP

ADP

NADP+