This IBDP Biology blog post will look into an introduction of light dependent reaction and also the summary of the process, let's go!
Light Dependent Reactions
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4979856/932724_683472.png)
Conversion of light energy into a flow of excited electrons
The following processes take place:
- Photoactivation
- Photolysis
- Electron Transport Chain
- Chemiosmosis
- ATP synthesis
- NADP reduction
Two types photosystems are embedded in the Tylakoid membrane. Photosystem i and Photosystem 2. The difference between the two photosystems:
- Photosystem i is sesitive to light wavelengths of 700 nm
- Phtosystem ii is sesitive to light wavelengths of 680 nm
Photosystem: Clusters of hundreds of photosynthetic pigments that collect light energy (including wavelengths) and pass it to Chlorophyll at the reaction centre
Reaction Centre: A central Chlorophyll molecule
Summary of LDR
- Chlorophyll is part of a group of pigment molecules in photosytems
- Pigments in photosystems (chlorophyll) absorb photons causing electrons within the pigment to be raised to a higher energy level/become excited
- Excited electons are passed from pigment to pigment till the reach Chlorophll A in the reaction centre of the photosystem
- The electrons are then passed to electron acceptors in the Tylakoid membrane
That's it for part 1!
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_60/4979856/43460_115121.gif)
References:
https://www.google.com/url?sa=i&url=http%3A%2F%2Fib.bioninja.com.au%2Fhigher-level%2Ftopic-8-metabolism-cell%2Funtitled-2%2Flight-dependent-reactions.html&psig=AOvVaw1o4KWCOPmK9P_XHYJHQOuz&ust=1627831549486000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCMDd0pzPjfICFQAAAAAdAAAAABAI
Drafted by Venetia (Biology)