BIOLOGY TEST

What is the characteristic of all catalyst ?

• They are broken down in the reaction

• They are made in the pancreas

• They are not changed by the reaction

• they do not change the rate of the reaction

Which of these statements about enzymes are correct

1. 1. enzymes are proteins

2. 2. enzymes are used up during chemical reaction

3. 3. enzymes speed up metabolic reactions

• 1, 2, and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

What is the substrate for enzyme X ?

• 
• 
• 
• 

• A

• B

• C

• D

The diagrams show a protease enzyme catalysing the breaking of part of a protein molecule into smaller pieces . Which diagram has three correct labels ?

• 
• 
• 
• 

Which changes could cause en anzyme to denature ?

1. 1. change in pH

2. 2. change in temperature

3. 3. change in substrate concentration

• 1, 2, and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

The graph shows the effect of temperature on the rate of a reaction catalysed by an enzyme

Which statement explains the shape of the graph at section X ?

• The enzyme is not the correct one to act on this substrate

• The enzyme is starting to denature

• The number of active sites is increasing

• the frequency of enzyme-substrate collision is increasing

The graph shows the effect of pH on the rate of an enzyme-catalysed reaction

What explains the effect of pH on the reaction rate ?

• as the pH increases from 5 to 7, the kinetic energy increases

• as the pH increases from 7 to 9, the frequency of enzyme and substrate collisions increases

• the shape of the enzyme's active site changes as the pH increases from 7 to 9

• the substrate denatures at pH7

What is independent variable of the investigation ?

• pH level

• temperature

• time taken

• starch solution

Which statement about photosynthesis is correct ?

• carbon dioxide and glucose are the raw materials

• carbon dioxide and glucose are the produced

• oxygen and glucose are the produced

• oxygen and glucose are the raw materials