PEDS101 Chapter Notes - Chapter 4: Metabolic Pathway, Rna Interference, Addition Reaction

• School: University of Alberta
• Department: Physical Education and Sport
• Course: PEDS101
• Professor: Michael Kennedy

Document Summary

Energy is used to perform work: all living organisms obtain, store, and use energy to fuel their activities. In a cellular level, movement includes organelles moving around in a cell, cells changing shape, & cilia & flagella beating. At the macroscopic level in animals, movement usually involves muscle contraction. Energy comes in 2 forms: kinetic & potential: we speak of energy stored in chemical bonds. All types of energy share an ability to appear in 2 forms: kinetic energy is the energy of motion. ex. Ball rolling down a hill, heat warming a frying pan, or electric charge flowing through power lines: potential energy is stored energy. ex. Potential energy is stored in concentration gradients & chemical bonds. It is transformed into kinetic energy, when needed to do chemical, transport, or mechanical work. Energy is transferred between molecules during reactions: using chemical reactions, cells transform the potential energy of chemical bonds into kinetic energy for growth, maintenance, reproduction, & movement.