energy molecules for cells
DESCRIPTION
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 PresentationTRANSCRIPT
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Energy molecules for cells
SBI 3U
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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.
• 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.
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All living cells need energy
• All 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 reactions– Endergonic: energy is taken in (entrance)– Exergonic : energy is given out (exit)
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REDOX reactions
• losing and gaining of electrons• Reduction/Oxidation • Reaction in cells is about losing and gaining
electrons.
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OILRIG
• Mnemonic (memory tool)• Oxidation is losing electrons (OIL)• Reduction is gaining electrons (RIG)
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ATP - Adenosine Triphosphate
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NAD - Nicotinamide adenine dinucleotide
• is a coenzyme• Coenzymes 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.