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