Chapter 6 Outline

Chapter 6 Outline - Chapter 6 Metabolism of Prokaryotic...

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

View Full Document Right Arrow Icon
Chapter 6 Metabolism of Prokaryotic Cells Introduction 6.1 Enzymes and Energy in Metabolism Enzymes Catalyze All Cellular Reactions Enzymes increase the probability that chemical reactions will occur Enzymes are not changed by the reactions, and can be reused Enzyme activity is highly specific Enzymes act on substrates Enzymes Act through Enzyme-Substrate Complexes Enzymes align substrate molecules in such a way that a reaction is energetically favorable Substrates bind to the enzyme at the active site, which is specific to the substrate Enzymes lower the activation energy so a reaction is more likely to occur by weakening the chemical bonds in the substrate Enzymes can be made entirely of protein, or have a complementing substance, such as a metal ion (cofactor) or organic molecule (coenzyme) Enzymes Often Team Up in Metabolic Pathways A metabolic pathway is a sequence of chemical reactions, each reaction catalyzed by a different enzyme, in which the product of one reaction serves as the substrate for the next reaction Enzyme Activity Is Regulated and Can Be Inhibited Feedback inhibition hinders metabolic pathways by inhibiting an enzyme in the pathway so no product is available to feed the next reaction Changing the shape of an active site (noncompetitive inhibition) or blocking an active site (competitive inhibition) are other types of inhibition Energy in the Form of ATP is Required for Metabolism ATP (adenosine triphosphate) is the cellular “energy currency,” providing energy for movement, cell division, protein synthesis, etc. Energy is released from ATP when the bond holding the last phosphate group on the molecule
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/17/2009 for the course MIC 201 taught by Professor Lacroix during the Spring '08 term at Rhode Island.

Page1 / 3

Chapter 6 Outline - Chapter 6 Metabolism of Prokaryotic...

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