Class notes Biology (SBIBOOO)

INTRODUCTION


BIOLOGICAL SCIENCES

,CHEMICAL REACTIONS AND ENZYMES

,CHAPTER 5: CHEMICAL REACTIONS
AND ENZYMES
 Starting chemical reactions
 Energy flow and change in living systems
 Enzymes and activation energy
 Enzymes and active sites
 Factors affecting enzyme activity
 Cofactors and coenzymes
 The structure of ATP
 How ATP stores, transfers and releases energy

, ATP powers cellular work by coupling
exergonic reactions to endergonic
reactions
 A cell does three main kinds of work
 Chemical
 Transport
 Mechanical
 To do work, cells manage energy resources by
energy coupling, the use of an exergonic process
to drive an endergonic one
 Most energy coupling in cells is mediated by ATP

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