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.