University:
Boston University
Course:
CAS BI 203 | Cell Biology
Academic year:

2020
Views:

186

Pages:

4
Author:

Alma Stephenson

Chapter 6 How Cells Harvest Chemical Energy PowerPoint Lectures for Campbell Biology: Concepts & Connections, Seventh Edition Reece, Taylor, Simon, and Dickey 10. 10. 20 24 Introduction ▪ In eukaryotes, cellular respiration – harvests energy from food, yields large amounts of ATP, and – Uses ATP to drive cellular work ▪ A similar process takes place in many prokaryotic organisms. Thermodynamics ▪ Thermodynamics is the study of energy transformations that occur in a collection of matter. ▪ Scientists use the word – System for the matter under study, and – Surroundings for the rest of the universe – first law of thermodynamics, energy in the universe is constant, and – second law of thermodynamics, energy conversions increase the disorder of the universe. ▪ Entropy is the measure of disorder, or randomness 5.11 Chemical reactions either release or store energy ▪ Exergonic reactions release energy. – These reactions release the energy in covalent bonds of the reactants – Burning wood releases the energy in glucose as heat and light – Cellular respiration – involves many steps, – releases energy slowly, and – uses some of the released energy to produce ATP