M9

• FALSE

  Enzymes are large molecules that increase the rates of chemical reaction with themselves undergoing any change.
• SUBSTRATE = Any substance that is acted upon by an enzyme is called a(n)
• OPTIMUM TEMPERATURE

  It is the temperature at which the rate of reaction involving the enzyme is at its greatest. 
• LOCK & KEY model = This representation assumes that the enzyme is a rigid three-dimensional body, which contains an active site that has a restricted opening that only one substrate can fit.
• TRUE

  Enzymes are mostly globular proteins
• Salivary amylase is an enzyme in humans that breaks down starch. The optimum pH for this reaction is 6.7. The rate of this reaction would not be affected by = maintaining the pH of the reaction at 6.7 
• At high temperatures, the rate of enzyme action decreases because the increased heat = alters the active site of the enzyme
• A certain enzyme will hydrolyze egg white but not starch = Enzyme molecules are specific in their actions. 
• FALSE

  At temperatures above 40°C, the rate of reaction will be faster.
• environmental condition that has the LEAST effect on the rate of enzyme controlled hydrolytic reactions in humans = the amount of light present 
• Enzymes influence chemical reactions in living systems by = affecting the rate at which reactions occur 
• TRUE

  Enzymes cannot make a reaction take place that would not occur without them
• Increasing this factor results to an initial increase in the rate of activity until it reaches a point after which the rate stays the same = SUBSTRATE CONCENTRATION
• The "lock and key hypothesis" attempts to explain the mechanism of = ENZYME SPECIFICITY
• FALSE

  The reactant in an enzyme-catalyzed reaction is the active site.