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