Which of the following is NOT true of a noncompetitive inhibitor?
The enzyme active site can change shape
The reaction may be completely prevented
It is possible for a substrate to still bind to the enzyme
The inhibitor can bind in the active site
What is the main function of an inhibitor?
Decrease the rate of reaction
Positively regulate an enzyme's activity
Increase the rate of reaction
Disrupt an enzyme's activity
Which of the following is NOT true of lactase?
It can break down different sugar substrates besides lactose
It forms an enzyme-substrate complex with lactose
Lactose binds in its active site
It is an enzyme
Which of the following is true about enzymes?
Enzymes lower the activation energy
Enzymes raise the activation energy
Enzymes leave the activation energy the same
Enzymes increase the temperature
Competitive inhibition involves an inhibitor
Binding away from the location
Recognizing a substrate
Binding to the active site
Initiating enzyme function
Many coenzymes are derived from _____.
metals
inorganic molecules
vitamins
All of these answers are correct.
What is induced fit?
A chemical reaction in a cell
The rise in the free energy in a cell
A change in enzyme shape to bind to a substrate
The barrier to a chemical reaction in the cell
Which of the following statements is true about cofactors?
Cofactors are required for some enzymes to function
All of the answers are correct
Cofactors increase the rate of reaction
Coenzymes are a specific type of cofactor
An activator could have the following effect on an enzyme:
Decrease in enzyme function
Inhibition of substrate binding
Increase of reaction rates
Increase in inhibitor binding
Cellular respiration includes a step that converts pyruvate into Acetyl coA. Acetyl coA is also known as Coenzyme A. This implies that Acetyl coA _____.
is a metal ion
helps an enzyme perform a function
is bound tightly to the enzyme
is one of the enzymes performing the 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 reaction has been catalyzed.
The active site has changed shape
An activator is bound to the substrate
A competitive inhibitor is bound to the enzyme
An enzyme will reach its saturation point
when no more enzyme is available to work on substrates
when it is at an optimum pH
when it is at an optimum temperature
when no more substrates are available
Which of the following would likely NOT increase a reaction rate of an enzyme in your mouth that was not yet at optimal conditions?
more substrate
neutral pH
extremely high temperature
more enzyme
What type of bond is often formed between prosthetic groups and proteins?
Amino acid
Metal
Hydrogen
Covalent
The location of substrate binding is called the
Catalyst
Induced Fit
Active Site
Lactose
A coenzyme is differentiated from the broader class of cofactors because it is _____.
All of these answers are correct.
inorganic
metal
organic
Iron binds tightly to the heme group in the protein hemoglobin. What type(s) of helper molecule would this be considered?
The process through which food is converted to energy inside
The process through which oxygen is converted to energy
The process through which food enters the cell
The process through which oxygen enters the cell
The optimum pH of the enzyme malatase is 6.5. What will happen to this enzyme at a pH of 3.1?
The enzyme will continue working normally
The enzyme will denature and stop working
The enzyme will not suffer any change
None of the answers are correct
Pepsin works optimally in your stomach due to its
Acidic pH
high temperature
basic pH
low temperature
The change in overall energy of a reaction is
slower with the help of an enzyme
faster with the help of an enzyme
Unchanged with the help of an enzyme
Increased with the help of an enzyme
The following conditions can denature an enzyme
increased substrate concentration only
extreme temperature only
extreme pH and increased substrate concentration
extreme temperature and extreme pH
Which of the following is NOT true of enzyme regulation?
Enzyme regulation ensures control on enzyme function
An enzyme can be negatively regulated
An enzyme can be positively regulated
All enzymes are regulated by the same inhibitors
Which of the following occur at the point of saturation?
The reaction rate plateau and reaches its maximum
The reaction rate becomes faster
None of the answers are correct
Both answers are correct
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
An increase in temperature
Increases substrate concentration
Provides shape to an enzyme
Increases the likelihood a enzyme and substrate will collide
Changes the shape of the substrate