In Class Notes - Photosynthesis

11/2/22

Photosynthesis equation:

6CO2 + 6H2O (+ light energy) → C6H12O6 + ^ 6O2

Photosynthesis; LD

Reactants: light, H2O

Products: ^ O2, 18 ATPs, 12 NADPH

LID:

2 photosystems

PII PI

noncyclic phosphorylation - LD

In the chloroplast, the actual reaction happens in the thylakoid (when in stacks called granna)

Fluid in the stroma

Autotrophic organisms make their own food

Photosynthesis is endergonic, cellular respiration is exergonic

Test question about where the O2 byproduct comes from (H2O splits)

Chlorophyll is made of the pigments Chlorophyll A and B (p680 and p700), both in different photosystems

only plants can split water from the magnesium in the chlorophyll

the chlorophyll splits the water

Leo says Ger

Loss of electron = oxidation & Gaining of electron = reduction

photosystem 2 then 1

NADP

NAD

FAD

Energy carriers^, they carry energy in the form of electrons

11/3/22

6CO2 + 6H2O (+ light energy) → C6H12O6 + ^ 6O2

ALL PLANTS USE NON CYCLIC PHOTOPHOSPHORYLATION. (18 ATPS, 12 NADPHS)

Two major parts: Light dependent reaction and light independent reaction. Both occur in the chloroplast. Plant cells are the only organisms on earth with chloroplasts. Chloroplasts are double membraned and have their own ribosomes too!

Light dependent reaction: 2 photosystems, PII then PI. Non-cyclic photophosphorylation occurs.

Light independent reaction: Water and carbon dioxide and ATP all react in the thylakoid and the chlorophyll splits the water in each photosystem.

  1. light strikes chlorophhyll molecule (strikes magensium that it boosts an e- to another level and gives it enough enenergy overall to break a water molecule)
  2. Protons get pumped into thylakoid space
  3. The ATP Synthase changes its shape when the pH in the thylakoid is 1000 times higher than the stroma.

Rubisco is the most common protein on earth