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Energy in a CellPART 1
Photosynthesis and Cellular Respiration
http://www.youtube.com/watch?v=eo5XndJaz-Y
Predictions
Why do humans rely on plants?!!!
What biomolecule is formed?!!!
Importance of energy
Cells need energy to be able to carry out important metabolic functions to sustain life.–Ex: Active transport, cell
division, movement of flagella or cilia, transport, and storage of proteins
Energy Transformations
All energy originates from the sun Radiant energy is transformed into
chemical energy (glucose) during the process of photosynthesis.
Chemical energy (glucose) is transformed into another chemical (ATP) during the process of cellular respiration.
All organisms perform cellular respiration or fermentation to produce usable energy.
Energy Transformations
Radiant to Chemical
Chemical to Chemical
Photosynthesis
Light Energy
Oxygen
Water
Carbon Dioxide
Glucose
Cellular Respiration
Product
Reactant
Use the diagram to complete the following sentence stem:
Based on the energy transformations diagram, I
can infer that ________________________________________________________________________________________________
_____________________________
Autotrophs
Make their own food by using the energy from the sun
Plants, algae, some bacteria are able to produce glucose and store it as starch through the process of photosynthesis
Photosynthesis: the autotrophic process of producing sugars by converting light energy from the sun into chemical energy
Photosynthesis
Autotrophs trap electrons from light energy in the chloroplasts of their cells.
Use light energy to excite electrons
Use excited electrons to form the bonds in a sugar molecule
6H2O + 6CO2---------- C6H12O6 + 6O2
Glucose
Light Energy
Photosynthesis chemical equation
6CO2 + 6H2O→C6H12O6 + 6O2
6 carbon dioxide molecules+ 6 water molecules react to produce glucose + 6 oxygen molecules
Use the equation for photosynthesis to answer the question…… How is oxygen made during the
process of photosynthesis? In other words where does the oxygen come from?
Chlorophyll
Photosynthesis also requires the pigment chlorophyll, which absorbsspecific wavelengths of light.
Chlorophyll – is found in the chloroplasts of autotrophic organisms and captures light energy from the sun
STAGES OF PHOTOSYNTHESIS
1) Energy captured from sunlight by being absorbed by chlorophyll
2) Light-dependent reactions – light energy converted to chemical energy temporarily stored as ATP and NADPH
3) Calvin cycle – chemical energy powers formation of organic compounds using CO2
How autotrophs capture sunlight energy
Click image to play video.
Photosynthesis
Exit Ticket:
Explain the role of CO2 in the formation of organic molecules.