Energy molecules for cells. SBI 3U. Key terms. Catalysis : the rate of a chemical reaction is either speeded up or slowed down by a catalyst. Metabolism : the sum of all the chemical processes happening in a cell/organism. - PowerPoint PPT Presentation
Energy molecules for cells
Energy molecules for cellsSBI 3UKey termsCatalysis: the rate of a chemical reaction is either speeded up or slowed down by a catalyst.Metabolism: the sum of all the chemical processes happening in a cell/organism.Energy: required to do work. Can be converted from one form to another. E.G. Chemical energy in a battery can be converted to electrical energy and then light energy.All living cells need energyAll cells need energy to function. This energy comes from the bonds between atoms. (E.g. Glucose molecule)Is stored or released: is in the form of chemical energy.Two Types of reactionsEndergonic: energy is taken in (entrance)Exergonic : energy is given out (exit)REDOX reactions
losing and gaining of electronsReduction/Oxidation Reaction in cells is about losing and gaining electrons.OILRIGMnemonic (memory tool)Oxidation is losing electrons (OIL)Reduction is gaining electrons (RIG)
ATP - Adenosine Triphosphate
NAD - Nicotinamide adenine dinucleotide is a coenzymeCoenzymes are organic molecules used by enzymes to carry out their functions.Act as intermediate carriers of electrons NAD+ carries electrons from one reaction to another.