Chapter 17

Chapter 17 - Chapter 17 organisms show marked similarity in...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 17 organisms show marked similarity in the major pathways of metabolism types of organisms o phototrophs use light as energy source o chemotrophs use chemical compounds as energy sources chemoorganotrophs use organic compounds chemolithotrophs use inorganic compounds (always autotrophs) o autotrophs use CO 2 as carbon source o heterotrophs use organic compounds as carbon source metabolism : sum of chemical changes that convert nutrients into energy and chemically complex finished cellular products catabolism: oxidative degradation of complex organic nutrients to simpler oxidized energy-poor products; exergonic o ATP used directly for energy requiring processes; can be synthesized by substrate-level or oxidative phosphorylation substrate-level phosphorylation ( Step 10 of glycolysis) o NADH used to drive further ATP synthesis in oxidative phosphorylation See pg 17-4/5/6 in notes o NADPH used as source of reducing power for biosynthetic rxns anabolism: reductive synthetic process in which complex biomolecules are synthesized from simple precursors; endergonic glycolysis and TCA cycle are compartmentalized enzyme organization (options) o enzymes of a pathway are collected to form a discrete multienzyme complex (called metabolons) thus, intermediates arent lost/diluted o enzymes may be physically separate, soluble entities w/ diffusing intermediates o membrane-bound system: enzyme participants must diffuse in just the 2 dimensions of the membrane to interact w/ their neighbors amphibolic intermediates can be in both catabolism and anabolism anabolic pathway may not always match the catabolic pathway for the product o ex: glycolytic pathway has 10 steps, but gluconeogenesis has 7 steps reversed from glycolysis + 4 enzymes o pathways must be different (either completely or in key locations) b/c of equilibration...
View Full Document

This note was uploaded on 02/09/2010 for the course BIOL 3361 taught by Professor Zhang/spiro during the Fall '08 term at Dallas.

Page1 / 5

Chapter 17 - Chapter 17 organisms show marked similarity in...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online