Light dependant reaction

Question 1

photosynthesis process

Answer 1

1. capture light energy
2. make ATP + Reduced NADP+ (NADPH)
3. Use free energy of ATP + reducing power of NADP+ to make organic compounds (e.g glucose) from CO2

Question 2

locations of photosynthesis

Answer 2

thylakoid lumen: light reactions
thylakoid membrane: ETC
Stroma: Calcin cycle

Question 3

Light dependant reactions basics

Answer 3

• occur in thylakoid lumen
• light energy–> chemical energy (glucose)

Question 4

process of light dependent reactions

Answer 4

1. photo excitation: absorption of photon by electron of chlorophyll
2. electron transport: pump protiens, causes H+ gradient, electron carriers
3. chemiosmosis: create ATP using H protons

Question 5

PS2

Answer 5

• electron excited due to light strike (P680 * )
• transfered to primary acceptor molecule
• p680 * oxidizes water
• • electrol acceptor reduced by plastiquinone

Question 6

Antenna complex

Answer 6

1. absorb light
2. transfer energy to primary e- acceptor

• reaction centre before step 2 excited electrol w energy (has chlorophyll a)

Question 7

Names of linear etc thingies

Answer 7

1. Photosystem 2
2. plastiquinone
3. cyctochrome complex
4. plastocyanin
5. Photosystem 1
6. Ferredoxin
7. NADP+ reductase
8. ATP synthase

Question 8

cyclic etc

Answer 8

• Plants need both ATP and NADHP

cyclic ETC:
1. keeps concentration gradient, since atp synthase constantly working
2. used to balance ATP + NADPH levels, as NADPH is not made
3. made under conditions where there is an excess of NADPH, and more atp is needed

• ex. calvin cycle may not be using all the nadp completely, so