BIO 3 NOTES!🤓

Chapter 7: How cells harvest energy??????

Plants, algae, and some bacteria harvest energy of the sunlight through photosynthesis, coverts radiant energy(light of the sun)to chemical energy(glucose). Those organisms feed themselves are called AUTOTROPHS! Other organisms feed on others are called HETEROTROPHS! The process by which energy is harvested is cellular respiration-oxidation of organic compounds to extract energy from chemical bonds.

Cellular respiration

At the beginning of cellular respiration, energy rich electrons from the biomolecules get transferred from one molecule to another (example; Glucose(C6H12O6). At the termination of respiration, once energy rich electrons get depleted of their energy and then get transferred to a final electron acceptor.

Aerobic respiration

With O2(oxygen)

Final electron acceptor is O2(oxygen). Most efficient way of getting ATP with the LEAST amount of input.

Anaerobic

Without O2(oxygen)

Final electron acceptor is an inorganic molecule other than oxygen.

Fermentation

Organic molecule is the final electron acceptor.

Aerobic respiration chemical formula

C6H12O6(glucose)+6O2(oxygen)—>6CO2(carbon dioxide)+6H2O(water)+energy(heat and ATP)

Overview of aerobic respiration

1)Glycolysis cytoplasm “splitting of glucose”

2)Oxidation of pyruvate

3)Krebs cycle

4)Electron transport chain

Decarboxalation

Oxygen binds to carbon making CO2