Photosynthesis and Cellular respiration
• Both pathways have to do with the gathering and storing of energy to sustain life in living things.
• 6CO2+ 6H2O + energy → C6H12O6+ 6O2
• C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
ATP Adenosine Triphosphate
• One of the principal chemical compound that cells use to store and release energy is ATP (chemical energy)Energy stored in cells: ADP ATPEnergy released in cells: ATP ADP
• Cells generate ATP/ADP as needed by using energy in foods like glucose
ATPATP is like a charged up battery
ADP ATP
Energy
EnergyAdenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP)
Partiallychargedbattery
Fullychargedbattery
PHOTOSYNTHESIS
• In photosynthesis, energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide
CO2 + H2O Sugars + O2Chloroplast
Light Energy
YOUR TURN
• 6CO2+ 6H2O + energy → C6H12O6+ 6O2
• ____________ uses the energy of ____________ to convert ____________ and ____________ into high energy ____________ and ____________.
Light and Dark Reaction
• Light reaction: water molecule is split and oxygen is released
• Dark reaction (or Calvin cycle): H (from H2O) combine with CO2 to from glucose
Photosynthesis: 2 parts
• Light reaction: – happens inside the
thylakoids– Traps light energy
(with pigments) and converts it into chemical energy (ATP)
– Pigments are light absorbing molecules; main one is chlorophyll
• Dark reaction– Happens in the stroma– Uses ATP from light
reaction to produce high energy sugars
Absorption of Light byChlorophyll a and Chlorophyll b
V B G Y O R
Chlorophyll b
Chlorophyll a
Chlorophyll and light
• Chlorophyll absorbs blue and red. That is why plants are green
NOTES
• In photosynthesis, energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide
• 6CO2+ 6H2O + energy → C6H12O6+ 6O2
From Photosynthesis to Cellular Respiration
• After plants have made glucose (P/S), glucose is broken down in the mitochondria (cellular respiration) so the cell can use the energy
Two Types of cellular respiration
• Aerobic (with oxygen) 36 ATP
• Anaerobic (without oxygen/”fermentation”) 2 ATP