Energy in A Cell

Why do cells need energy? Transport materials Cell division Production of proteins

Source of Cell’s Energy ATP Adenosine triphosphate Energy is available when ATP ADP +P +energy The energy is in the last phosphate bond A-P-P~P A-P-P +P +ENERGY

Photosynthesis 6CO2 + 6H2O C6H12O6 +6O2

Photosynthesis Plants use ATP but must store it Photosynthesis- process of using the sun’s energy (light energy) to make glucose (chemical energy) Then the plant takes glucose and makes complex carbohydrates (stored energy)

2 PHASES PRODUCES ATP ,NADPH and Oxygen (Also called Calvin Cycle) 1. Light dependant- chlorophyll converts light energy into chemical energy- PRODUCES ATP ,NADPH and Oxygen 2. Light Independent- uses CO2 to produce glucose (Also called Calvin Cycle)

What happens when chlorophyll absorbs light? The electrons in chlorophyll are raised to a higher energy level. These electrons are passed to an electron carrier molecule: NADP+ NADP+ becomes NADPH ADP is also converted to ATP Occurs across the thylakoid membrane

Chloroplast Thylakoid contains pigment chlorophyll Absorbs all colors of wavelengths except green