Chapter 5 Respiration
Chapter 5 Respiration
Carbon metabolism Carbon cycles through photosynthesis and respiration. Energy (light) Photosynthesis CO H. Carbohydrates Respiration Energy(ATP)<
Respiration
Respiration Definition: ➢ The oxidative process occurring within living cells by which the chemical energy of organic molecules is released in a series of metabolic steps involving the consumption of oxygen and the liberation of carbon dioxide and water. • Excerpted from The American Heritage® Dictionary of the English Language, Third Edition © 1996 by Houghton Mifflin Company
Fuel for Respiration
“Fuel” for Respiration E.g. starch, glucose, fructose, and sometimes amino acids, organic acids or fats. ➢ We will focus on respiration of monosaccharides (e.g. glucose). ➢ Polysaccharides (e.g. starch) first need to be broken down into monosaccharides. ➢ Fats and amino acids enter the respiratory pathway at different points
Overview Energy
Overview ➢ Photosynthesis occurs in chloroplasts (chlorophyll) mostly in the green leaves. ➢ Carbohydrates produced in leaves are translocates throughout the plant (phloem). ➢ Carbohydrates are oxidized at destination sites to release energy, CO2 & water =RESPIRATION. • Sugar + O2 = CO2 + Water + Energy