Download Photosynthesis

CONVERTING ENERGY PARTY
DEFINITION
WHO
Photosynthesis
Cellular Respiration
Process in which light energy is converted
into organic molecules/chemical energy
Process by which cells produce ATP from
glucose
Autotrophs
(plants, some algae, some bacteria)
ALL organisms
Photo Phase
WHAT
“Light Dependent Reactions”
Step 1: Chlorophyll is energized by the sun
Step 2: Water molecules are split
Step 3: More energy is trapped in ATP
Step 4: Hydrogen is trapped by NADP
Step 5: Oxygen is released to atmosphere
when water is split
Synthesis Phase
WHERE
RSVP
Stage 1: Glycolysis
can take place with or without oxygen
glucose is broken down into 2 molecules of
pyruvic acid (pyruvate)
Uses 2 ATP molecules but produces 4 ATP
molecules = a net gain of 2 ATPs
Stage 2: if oxygen is present:
Aerobic respiration
Kreb’s Cycle & Electron Transport
Chain
“Dark Reactions”
“Light Independent Reactions”
Pyruvic acid is converted to CO2 & H20
36 molecules of ATP are formed from the
products of this reaction
Carbon Dioxide fixation – the transfer of
carbon dioxide to organic compounds
Total energy production aerobically is
38 ATP molecules
Calvin Cycle – uses carbon dioxide to make
sugar (glucose) with the a series of enzymeassisted chemical reactions
Stage 2: if NO oxygen is present
Anaerobic respiration:
Fermentation
Step 1: CO2 from atmosphere combines
with RuBP to produce a 6-carbon sugar
Step 2: The 6-carbon sugar splits to 2
molecules of PGA
Step 3: PGA combines with Hydrogen
brought over by NADPH to form PGAL
and water
Pyruvic acid is converted to CO2 and either
lactic acid or alcohol
6 turns of this cycle produces one glucose
No additional ATP is produced
Total energy anaerobically is 2 ATP
molecules (from glycolysis)
Leaves of Plants: Chloroplast
Mitochondria
Photo Phase – Grana (stacks of thylakoids)
Synthesis Phase - Stroma
Glycolysis - Cytoplasm
1 – 800 – CALL - SUN
1 – 800 - ENZY - MES
Lactic Acid Fermentation – produces
lactic acid as byproduct, sore muscles
Alcoholic Fermentation – produces
ethanol; carbon dioxide is released
(yeast and some bacteria)