1) When an enzyme changes shape and becomes non-functional due to factors like extreme pH and temperature, the enzyme is said to be a) denatured b) irreversible c) altered d) damaged 2) The reactants in a chemical reaction is known as a) enzymes b) substrates c) enzyme-substrate complex d) products 3) Which line in the graph shows the presence of an enzyme in a chemical reaction? a) Line 1 b) Line 2 c) None of them d) All of them 4) Which of the following is NOT true about enzymes? a) Enzymes are proteins b) Enzymes lower the activation energy c) Enzymes react with the substrate in a chemical reaction. d) Enzymes are not used up in many chemical reactions 5) People with milk digestion problems most likely have difficulties producing which enzyme? a) lactase b) maltase c) lactose d) amylase 6) _________________ is the region of an enzyme where a substrate binds in a chemical reaction. a) active site b) binding site c) membrane receptor d) allosteric site 7) The ___________________________ model of enzyme action describes how an enzyme slightly changes its shape in order for a substrate to fit in better. a) lock and key b) induced fit c) enzyme-substrate specificity d) protein 8) Which graph shows the effect of pH on enzyme activity? a) b) c) d) 9) Which model of enzyme activity describes a perfect fit between the substrate and the active site of an enzyme? a) lock and key b) induced fit c) enzyme-substrate specificity d) protein 3D model 10) The graph shows the effect of what factor in enzyme activity? a) temperature b) pH c) activation energy d) substrate concentration 11) Which graph shows the effect of temperature on enzyme activity? a) b) c) d) 12) The highest temperature at which an enzyme maximizes its activity is called the ________________ temperature. a) optimum b) capacity c) denaturing d) maximal 13) Which enzyme catalyzes chemical reactions that breaks down a carbohydrate into glucose and galactose? a) lactase b) maltase c) sucrase d) amylase 14) Animals such as cows, horses and goats are able to digest cellulose because of their enzyme called _____________________. a) cellulase b) pectinase c) lactase d) amylase 15) Which of the following is the substrate? a) Hydrogen peroxide b) Water c) Catalase d) Oxygen 16) Which of the following is NOT an enzyme? a) Amylase b) Sucrose c) Pepsin d) Catalase 17) _____________________ energy is the energy required for a chemical reaction to take place. a) activation b) reaction c) activating d) kinetic 18) What happens to enzyme activity at low temperature? a) rate of reaction is high b) enzymes become denatured c) enzymes are not active d) enzymes achieve activation energy 19) What affect does extremely high pH have on enzymes? a) activates them b) kills them c) denatures them d) damages them 20) What type of enzyme is amylase? a) lipase b) nuclease c) protease d) carbohydrates

(Bio) Enzymes

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