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