Www.soran.edu.iq M. Saadatian Photosynthesis 1. Photosynthesis.
Photosynthesis
27
Ⓒ Richard Mayberry
description
Photosynthesis. Energy for Life. Ⓒ Richard Mayberry. Two Stages:. Light Phase & Dark Phase. The Light Reactions. Light Energy. Light Energy from the sun powers photosynthesis. Light Phase. Light Energy. Chlorophyll. Coated. Thylakoid. Disks. in Grana. Light Phase. - PowerPoint PPT Presentation
Transcript of Photosynthesis
Ⓒ Richard Mayberry
Light Energy
Light Energy from the sun powers photosynthesis.
Light Energy
Chlorophyll
Coated
Thylakoid
Disks
in Grana
This Energy enters the chloroplasts of plant cells.
Light Energy
Chlorophyll
Coated
Thylakoid
Disks
in Grana
Chlorophyll converts light to chemical energy.
Light Energy
Chlorophyll
Coated
Thylakoid
Disks
in Grana
O
H H
O
H H
Breaks Bonds
Breaks Bonds
Some of this energy breaks bonds in water.
Light Energy
Chlorophyll
Coated
Thylakoid
Disks
in Grana
O
H H
O
H H
O2
Oxygen gas is released by the cell.
NADP
NADP
NADPH2
NADPH2
Light Energy
Chlorophyll
Coated
Thylakoid
Disks
in Grana
H H
H H
O2
Hydrogens are collected by NADP molecules.
O2
NADP
NADPH2
NADP
NADPH2
Light Energy
Chlorophyll
Coated
Thylakoid
Disks
in Grana
H H
H H
O2
ADP
ADP
PADP
PADP
P
P
Some of the energy makes ATP molecules by bonding ADP and Phosphate.
RuBP
CO2
Unstable
6-Carbon
Sugar
CO2 combines with RuBP to form a 6-carbon sugar.
CO2
RuBPUnstable
6-Carbon
Sugar
PGA
PGA
The sugar splits into two PGA molecules.
CO2
RuBPUnstable
6-Carbon
Sugar
PGA
PGA
ATP
ADP
ATP
ADP
ATP gives a phosphate to PGA.
PGA~P
PGA~P
CO2
RuBPUnstable
6-Carbon
Sugar
PGA
PGA
ATP
ADP
ATP
ADP
PGA~P has extra energy for the next step.
PGA~P
PGA~P
CO2
RuBPUnstable
6-Carbon
Sugar
PGA
PGA
ATP
ADP
ATP
ADP
P
P
Removing the phosphate releases energy.
PGA~P
PGA~P
CO2
RuBPUnstable
6-Carbon
Sugar
PGA
PGA
ATP
ADP
ATP
ADP
P
P
NADPH2
NADP
NADPH2
NADP
The energy helps NADPH add hydrogen to the PGA.
PGA~P
PGA~P
CO2
RuBPUnstable
6-Carbon
Sugar
PGA
PGA
ATP
ADP
ATP
ADP
P
P
NADPH2
NADP
NADPH2
NADP
PGAL
PGAL
This results in production of PGAL molecules.
The plant has:
PGAL
PGAL
To Cytoplasm
Respiration
Send both PGAL’s out for immediate respiration.
PGAL
PGAL
GLUCOSE
P
PCombine 2 PGAL’s and remove the phosphates to make Glucose.
ADP ATP
ADP ATP
PGAL
PGAL
RuBP
H2O
CH2O
Combine 2 PGAL’s and split into multiple products.
PGAL
PGAL
RuBP
H2O
CH2OX 6
C6H12O6
GLUCOSE
