University:
Concordia University Wisconsin
Course:
BIO 1401 | General Biology I
Academic year:

2021
Views:

282

Pages:

6
Author:

Hallie Randolph

Cellular Respiration & Fermentation Energy flows into an ecosystem as sunlight and exits as heat; the chemical elements essential to life are recycled. Y Figure 5.2 Energy flow and chemical recycling in ecosystems. Energy flows into an ecosystem as sunlight and ultimately leaves as heat, while the chemical elements essential to life are recycled. Light energy ECOSYSTEM COHO Photosynthesis in chloroplasts Cellular respiration in mitochondria Organic molecules+0 ATP powers most cellular work Cellular Respiration CuHiz Out 602 6CO₂+ ATP Aerobic Respiration: most efficient catabolic pathway; oxygen is consumed as a reactant Acrobic with oxygen Anaerobic Respiration: reactants in a similar process that harvest chemical energy w/o oxygen. Anacrobic without oxygen. ATP Heat energy Redox Reactions: oxidation reduction reactions; In many chemical reactants, there is a transfer of one or more elections (c) from one reactant to another. Oxidation loss of electrons (c) from one substance Oxidizing Agent Electron Acceptor Na Na becomes oxidized (loses electron) CI becomes reduced (gains electron) Y Preduction addition of electrons to another substance Xe becomes oxidized ← + Y X + Ye becomes reduced CI Reducing Agent > Electron Donor Xe Methane Combustion as an energy-yielding redox reaction Reactants becomes oxidized Products CHA 20 CO Energy 2 H₂O becomes reduced t HCHO00OHOH Methane (reducing agent) Oxygen (oxidizing agent) Carbon dioxide Water Not all redox reactions involve the complete transfer of electrons from one substance to another; some change the degree of electron sharing in covalent bonds. Methane Combustion is an example