Which of the following is NOT true of enzyme regulation?
An enzyme can be negatively regulated
An enzyme can be positively regulated
All enzymes are regulated by the same inhibitors
Enzyme regulation ensures control on enzyme function
An activator could have the following effect on an enzyme:
Increase of reaction rates
Increase in inhibitor binding
Inhibition of substrate binding
Decrease in enzyme function
A non-substrate molecule binds to an enzyme but does not bind at the active site. The enzyme is now unable to bind its substrate. What has likely occurred?
The active site has changed shape
An activator is bound to the substrate
A competitive inhibitor is bound to the enzyme
The reaction has been catalyzed.
What is induced fit?
A chemical reaction in a cell
A change in enzyme shape to bind to a substrate
The barrier to a chemical reaction in the cell
The rise in the free energy in a cell
Which of the following is true about enzymes?
Enzymes leave the activation energy the same
Enzymes increase the temperature
Enzymes lower the activation energy
Enzymes raise the activation energy
Enzymes are known as catalysts; this means that they can _____.
None of the answers are correct
Lower the activation energy of a reaction
Both answers are correct
Make a chemical reaction go faster
The change in overall energy of a reaction is
Unchanged with the help of an enzyme
faster with the help of an enzyme
Increased with the help of an enzyme
slower with the help of an enzyme
Which of the following is NOT true of lactase?
Lactose binds in its active site
It can break down different sugar substrates besides lactose
It forms an enzyme-substrate complex with lactose
It is an enzyme
The location of substrate binding is called the
Catalyst
Induced Fit
Lactose
Active Site
