Presentation on theme: "State Standard SB1B - Explain how enzymes act as catalysts."— Presentation transcript:
State Standard SB1B - Explain how enzymes act as catalysts.
Physical vs. Chemical A ____________ change alters the substance’s ___________ but ______ its ____________. There is _____ formation of a new substance. 6.2 Chemical Reactions Chemistry in Biology Physical reaction Chapter 6
Physical vs. Chemical Cont’d A __________ __________ is the process by which atoms or groups of atoms in substances are reorganized into __________ __________. 6.2 Chemical Reactions Clues that a chemical reaction has taken place include the production of ________ or ________, and formation of a ________, ________, or _______. ________ reversible! Chemistry in Biology Chemical reaction Chapter 6
Chemical Equations Chemistry in Biology Chemical formulas describe the ____________ in the reaction and arrows indicate the process of ____________. Chemical equations have 2 sides: ____________ are the starting substances, on the left side of the arrow. ____________ are the substances formed during the reaction, on the right side of the arrow. 6.2 Chemical Reactions Chapter 6
Example of a chemical equation: During cellular respiration, Glucose and oxygen __________ to form carbon dioxide and water. Chemistry in Biology 6.2 Chemical Reactions Chapter 6 Chemical Equations Cont’d Practice your knowledge by labeling the parts of the equation above.
Chemistry in Biology The ___________ ____________ is the minimum amount of energy needed for reactants to form products in a chemical reaction. Energy of Reactions 6.2 Chemical Reactions Chapter 6
Chemistry in Biology A ____________ is a substance that ____________ the activation energy needed to start a chemical reaction. ____________ are ____________ that act as ____________ catalysts. It does not increase how ________ product is made – only how __________ it is made. Enzymes 6.2 Chemical Reactions Chapter 6
Chemistry in Biology All living things are driven by constant internal chemical reactions (____________). Enzymes help these reactions happen quickly enough for an organism to stay __________. Enzymes increase the rate (__________) of a reaction by lowering activation energy. 6.2 Chemical Reactions Chapter 6 Enzymes Cont’d
Chemistry in Biology The reactants that bind to the enzyme are called ___________. The specific location where a substrate binds on an enzyme is called the __________ ________. 6.2 Chemical Reactions Chapter 6 Enzymes Cont’d
Chemistry in Biology 6.2 Chemical Reactions Chapter 6 The active site changes shape and forms the __________-__________ _________, which helps chemical bonds in the reactants to be broken and new bonds to form. This is called __________ ______. Enzymes Cont’d
Chemistry in Biology Enzyme activity is affected by factors such as _____, ____________, & other substances. ____________ pH & temperature can change the ________ of the enzyme and render it ________. This is called ____________. 6.2 Chemical Reactions Chapter 6 Enzymes Cont’d
Chemistry in Biology Enzymes are __________ for the substrates that they react with… Enzyme names end with the suffix “-______”. Examples: ____________ breakes down the sugar sucrose ____________ breaks down the sugar lactose ____________ breaks down protein molecules 6.2 Chemical Reactions Chapter 6 Enzymes Cont’d
Chemistry in Biology Enzyme action is often compared to the action of ________ & ________… 6.2 Chemical Reactions Chapter 6 Enzymes Cont’d …because each enzyme is shaped to fit together with a ____________ substrate and they are ____________.