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**The Light Dependent Reaction** Cheat Sheet (DRAFT) by

1st of 2 Stages of Photosynthesis

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Light Dependent Reaction

Here solar energy is used to manufa­cture ATP

IMPO­RTANT

Photo
Means Light
 
(Light Dependent Reaction
Synthesis
Means Make
 
(Light indepe­ndent reacti­on/­Calvin Cycle)

Chlo­roP­lasts

Where Photos­ynt­hesis Happens
Chloro­plasts are organelles
They Have a Double Membrane
Thylakoid Membrane location of Light dependent reaction

Glossary

Photop­hos­pho­ryl­ation
adding phosphate using light
Photolysis
Splitting a molecule using light
Photoi­oni­sation
Light energy excites electrons in atom

2 Processes of Light dependent reaction

Electron Transport
brings about the reduction of NAD.2H
Phosph­ory­lation adding phosphate to a molecule using light
Produces ATP from ADP and Pi

Metabolic Pathway

A sequence of linked chemical reactions
Product of each reaction is referred to as a interm­ediate

Formula

H2O---­->2H+ +2e- + 1/2 O2
Light strikes chloro­phyll molecule
Photoc­hemical reaction happens
Energy from light splits H2O into consti­tuent parts
Electron move down ETC
co Enzymes NADP collects electrons and goes to NAPD.2H
 

2 Stages of Photos­ynt­hesis

Light Dependent Reaction
Light Indepe­ndent Reaction / Calvin Cycle

Chloro­plast

Super Basic Light Dependent Reaction

Light energy excites electrons in Chloro­phyll
Photolysis of Water Produces Protons, Electrons, and O2
Energy from electrons used to turn ADP into ATP
This also generates NADP.2H

Chemio­smosis

The process of Electrons flowing down the ETC
This creates a proton gradient across the membrane
This drives ATP synthesis
 

Light Dependent Reaction Basic

Reaction needs Light energy to start with
 
Takes place in the Thylakoid Membrane
 
Light energy absorb by the chloro­phyll
 
This Excites Electrons in chloro­phyll
 
Chloro­phyll has been Photoi­onised (giving more enegy to electrons)
 
Energy from electrons used to turn ADP into ATP
 
NADP take electrons and turn into NADP.2H
 
ATP carries energy
 
NADP.2H carries hydrogen
 
During light dependent reaction O2 is Released by oxidis­iation

Electron Transport Chains

Systems in the Thylakoid Memebrane are linked by ETC
These transfer Electrons
Flow of Electrons creates a Photon Gradient across membrane
This drives ATP Synthesis
Referred to a CHEMIO­SMOSIS

Energy in Light-d reaction used for 3 things

Making ATP from ADP and Pi
Making NADP.2H from NADP
Splitting Water into Protons (H+) and electrons and oxygen