2-3 ATP+Photosynthesis

Question 0

Animals need Energy for ?

Answer 0

Muscle contraction 
Maintain body temp
AT
DNA replication 
Cell division 
Protein synthesis

Question 1

Plants need energy for?

Answer 1

Photosynthesis 
AT
Dna replication 
Cell division 
Protein synthesis

Question 2

ATP properties ?

Answer 2

️ADP+Pi↔️ATP
ATP synthase
ATPease

ATP specific properties- good energy source:

1) Stores+releases small manageable energy- efficient
2) Small soluble molecule-easily transported around cell
3) Easily broken down-single reaction -energy quickly released
4) Can’t pass out of cell-immediate supply of energy

Question 3

Light dependent reaction

Non cyclic phosphorylation

Answer 3

Happens in thylakoid membranes 
Light absorbed by photosystems used for:
1)ADP+Pi➡️ATP
2)NADP➡️reduced NADP
3)Split H2O➡️ H+,e-, O2 - photolysis 

Non-cyclic photophosphorylation:

1) Light energy absorbed by PS2 excited electrons in chlorophyll - higher energy level- move along transport chain to PS1
2) Excited electrons must me replaced in PS2- Light splits H2O
3) Excited e- lose energy as they move along chain- energy used to generate ATP (ATP synthase)
4) light absorbed by PS1 - excites e- to even higher energy level - e- an h+ (stroma) = Reduced NADP

Question 4

Cyclic photophosphorylation

Answer 4

e- from chlorophyll molecule not passed onto NADP - passed back to PS1 via electron carriers - recycled - only produce small amounts of ATP

Question 5

Light independent reaction AKA Calvin cycle

Answer 5

Happens in stroma

CO2(1C)+RuBP(5C) (rubisco enzyme)

  ⬇️ 2GP (3C) (Glycerate-3-phosphate)

  ⬇️ 2(ATP+reduced NADP used)

2TP (3C) (Triose Phosphate) ➡️Hexose

  ⬇️ (ATP USED)

RuBP

5/6TP regenerate RuBP- 3 cycles
So cycle turns 6x to produce 1 hexose sugar

Question 6

Limiting factors

Answer 6

1) Temp affects enzymes an stomata close (water loss) - increased by trapping heat from sun and heaters+Cooling systems
2) CO2-high-stomata closes- increased by Co2 generator - propane
3) light- high an right wavelength more energy - increased by in through day+lamps on at night