Introduction to Energy Conversion in Living Things

Autotrophs vs. Heterotrophs “Self Feeder” AKA: Producers Use light energy to make glucose Photosynthesis (Ch.8) “Self Feeder” AKA: Producers Use light energy to make glucose Photosynthesis (Ch.8) “Other Eaters” AKA: consumers Must obtain food by eating producers or other consumers Cellular Respiration (Ch.9) “Other Eaters” AKA: consumers Must obtain food by eating producers or other consumers Cellular Respiration (Ch.9)

Distinguish between kinetic and potential energy? Kinetic: Energy of motion Potential: stored energy

Energy can be converted… Where does energy originate? Initially from the sun! Initially from the sun! This energy is harnessed by... Plants who use it to create their own food. 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 CO 2 Broken down by cells to create energy (ATP)

Energy Equations 6CO 2 + 6H 2 O + Light  C 6 H 12 O 6 + 6O 2 Photosynthesis (process in which living things convert the energy from light into chemical potential energy stored in glucose and other high energy sugars) C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + 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 Equations Q: 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 Equations Fermentation-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 Types Alcoholic Fermentation: Pyruvic acid + NADH Pyruvic acid + NADH  Alcohol +CO 2 + NAD +

Energy Equations Lactic Acid Fermentation Pyruvic acid + NADH Pyruvic acid + NADH  Lactic acid + NAD +