Photosynthesis Flashcards
1
Q
How is the site of the light-dependent reaction specialised?
A
- Takes place in the thylakoids
- Thylakoid membranes provide large SA for attachment of chlorophyll and enzymes
- A network of proteins in the grabs hold the chlorophyll in a precise manner to allow maximum absorption of light
- The granal membranes have enzymes attached to manufacture ATP
- Chloroplasts contain both DNA and ribosomes so can quickly manufacture any proteins needed
2
Q
Describe the light independent reaction.
A
- CO2 diffuses into the lead through stomata and dissolves in wager around the walls of the mesothelioma cells
- It diffuses into the stroma of the choloplast
- CO2 combines with 5C RuBP using an enzyme to make 2 x 3C GP
- ATP (to ADP) and and NADPH (to NADP) reduce it to TP
- NADP goes back into the light dependent reaction
- Some TP is converted into useful organic substances and other regenerated RuBP using ATP (to ADP)
3
Q
How is the site of the light independent reaction specialised?
A
- Takes place in the stroma
- Stroma fluid contains all enzymes
- Surrounds grabs so products from light dependent reaction can readily diffuse out
- Contains DNA and ribosomes so it can quickly and easily manufacture proteins
4
Q
Describe the light-dependent reaction.
A
- Light hits the chlorophyll molecule which excited an electron, promoting it to a higher energy level
- It is passed down energy levels in a series of redox reactions which release energy and allow for the combination of ADP and Pi
- At the same time, water splits to produce O2, H+ and e-
- The H+ combined with NAD along with the electron to form NADPH
- The e- is fed back into the chlorophyll molecule
