ENZYMES AND OTHER HORRIBLE THINGS

• 1 and 2

• 1 and 3

• 1 only

• 2 and 3

Choose the true statements

• X is the catalysed reaction

• Y is the catalysed reaction

• Z is the energy gained by the product

• X is the uncatalysed reaction

• Z is the total energy change in the reaction

Which statements about the effects of ALL inhibitors are correct?

1. alter the shape of the active site

2. denature the enzyme

3. reduce the rate of the enzyme catalysed reaction

• 1,2 and 3

• 1 and 2 only

• 1 and 3 only

• 3 only

• Most enzyme molecules will have free active sites

• The number of available substrate molecules is high

• The number of enzyme-substrate complexes is low

• The rate remains the same if more enzyme is added

How is the Michaelis constant (Km) used?

• to compare the affinities of enzymes for their substrates

• to find the maximum velocity of an enzyme (Vmax)

• to find the rate at which substrate is convertd by an enzyme

• 1 and 2

• 1 and 3

• 2 and 3

• 1 only

In an experiment, 5 ml of salivary amylase are added to 100 ml of different concentrations of starch.

Which graph shows the results of plotting the initial rate of reaction against the concentration of substrate ?

• 
• 
• 
• 

Choose the true statements

• The ? shows the induced site

• The inhibition is non-competitive

• The enzyme becomes denatured

• The ? shows the allosteric site

• The inhibition is competitive

The picture shows:

• solvation

• diffusion

• cohesion

• adhesion

• mass flow

Choose which properties of water are affected by the presence of hydrogen bonds

• High adhesion

• Good solvent

• Latent heat of evaporation

• Specific heat capacity

• Maximum density at 4°C