Introduction to EnergyConversion in Living Things

Autotrophs vs. Heterotrophs“Self Feeder”AKA: ProducersUse light energy to make glucose Photosynthesis (Ch.8)

“Other Eaters”AKA: consumersMust obtain food by eating producers or other consumersCellular Respiration (Ch.9)

Distinguish between kinetic and potential energy?

Kinetic: Energy of motionPotential:

stored energy

Energy can be converted…

Where does energy originate?

Initially from the sun!

This energy is harnessed by...

Plants who use it to create their own food.

What is the relationship between Photosynthesis and Cellular Respiration?

* atoms get rearranged during these processes

Role of the Sun?

Role of Glucose?

Provide energy (sun light) which plants use to create glucose from water and CO2

Broken down by cells to create energy (ATP)

Energy Equations 6CO2 + 6H2O + Light C6H12O6 + 6O2

Photosynthesis (process in which living things convert the energy from light into chemical potential energy stored in glucose and other high energy sugars)

C6H12O6 + 6O2 6CO2 + 6H2O + 38 ATP

Cellular Respiration (process in which living things convert the chemical potential energy stored in glucose and other food into chemical potential energy in the form of ATP). This occurs in the presence of oxygen (aerobic process)

Energy EquationsQ: How are the equations of cellular respiration and photosynthesis related?A: They are inverses of each other (if you only account for the matter)

Energy EquationsFermentation-process in which living things convert the chemical potential energy in food into chemical potential energy in the form of ATP. This occurs in the absence of oxygen (anaerobic process)

Two TypesAlcoholic Fermentation:Pyruvic acid + NADH Alcohol +CO2 + NAD+

Energy EquationsLactic Acid FermentationPyruvic acid + NADH Lactic acid + NAD+