Lecture: ATP and Intro Lecture: ATP and Intro to Photosynthesisto Photosynthesis

and Cellular and Cellular RespirationRespiration

Energy and ATPEnergy and ATP Energy comes in many different formsEnergy comes in many different forms

Light, heat, electrical, chemical, etcLight, heat, electrical, chemical, etc Cells are powered by chemical energyCells are powered by chemical energy ATP- Adenosine Triphosphate- principle ATP- Adenosine Triphosphate- principle

compound used by all living things to fuel life compound used by all living things to fuel life processesprocesses Energy is in the bonds between phosphate groupsEnergy is in the bonds between phosphate groups Like a rechargeable battery, ATP- A charged battery, Like a rechargeable battery, ATP- A charged battery,

ADP-a dead batteryADP-a dead battery

Energy and Energy and CarbohydratesCarbohydrates

Carbs are much better for storing energy, 1 Carbs are much better for storing energy, 1 molecule of glucose has over 90x more energy molecule of glucose has over 90x more energy than a molecule of ATP!than a molecule of ATP!

Carbohydrates like glucose are made by Carbohydrates like glucose are made by autotrophs (producers) through photosynthesis autotrophs (producers) through photosynthesis or chemosynthesisor chemosynthesis

Photosynthesis occurs in the chloroplastPhotosynthesis occurs in the chloroplast Equation for Photosynthesis:Equation for Photosynthesis:

6CO6CO22 + 6H + 6H22O + energy O + energy C C66HH1212OO66 + 6O + 6O22

Carbon + water+ light Carbon + water+ light sugar + sugar + oxygenoxygen

dioxidedioxide

Cellular RespirationCellular Respiration Release of energy from food occurs in the Release of energy from food occurs in the

mitochondriamitochondria Most common pathway of obtaining Most common pathway of obtaining

energy from food occurs in the presence energy from food occurs in the presence of oxygen= of oxygen= cellularcellular respirationrespiration Aerobic organismsAerobic organisms

Equation for Cellular Respiration:Equation for Cellular Respiration:

6O6O2 2 ++ CC66HH1212OO66 6CO 6CO22 + 6H + 6H22O + O + energy energy

Oxygen + sugar Oxygen + sugar carbon + water + … carbon + water + …

dioxidedioxide

Sunlight energy

ECOSYSTEM

Photosynthesisin chloroplasts

GlucoseCO2

O2H2O

Cellular respirationin mitochondria

(for cellular work)

Heat energy

ATP

Physiological Energy Flow Physiological Energy Flow SummarySummary