Which of the following is true about enzymes?
Enzymes leave the activation energy the same
Enzymes lower the activation energy
Enzymes increase the temperature
Enzymes raise the activation energy
What type of bond is often formed between prosthetic groups and proteins?
Covalent
Amino acid
Hydrogen
Metal
What is the main function of an inhibitor?
Positively regulate an enzyme's activity
Disrupt an enzyme's activity
Increase the rate of reaction
Decrease the rate of reaction
Many coenzymes are derived from _____.
inorganic molecules
metals
All of these answers are correct.
vitamins
Competitive inhibition involves an inhibitor
Recognizing a substrate
Binding to the active site
Binding away from the location
Initiating enzyme function
Which of the following is NOT true of enzyme regulation?
An enzyme can be negatively regulated
An enzyme can be positively 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 and extreme pH
increased substrate concentration only
extreme temperature only
extreme pH and increased substrate concentration
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.
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 enzyme
neutral pH
extremely high temperature
more substrate
Which of the following is NOT true of lactase?
It can break down different sugar substrates besides lactose
It is an enzyme
It forms an enzyme-substrate complex with lactose
Lactose binds in its active site
The change in overall energy of a reaction is
faster with the help of an enzyme
slower with the help of an enzyme
Increased with the help of an enzyme
Unchanged with the help of an enzyme
Which of the following is NOT true of a noncompetitive inhibitor?
The reaction may be completely prevented
It is possible for a substrate to still bind to the enzyme
The enzyme active site can change shape
The inhibitor can bind in the active site
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
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 denature and stop working
The enzyme will not suffer any change
The location of substrate binding is called the
Induced Fit
Catalyst
Active Site
Lactose
Pepsin works optimally in your stomach due to its
high temperature
Acidic pH
low temperature
basic pH
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
An activator could have the following effect on an enzyme:
Increase in inhibitor binding
Increase of reaction rates
Decrease in enzyme function
Inhibition of substrate binding
An increase in temperature
Increases the likelihood a enzyme and substrate will collide
Provides shape to an enzyme
Changes the shape of the substrate
Increases substrate concentration
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
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
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 coenzyme is differentiated from the broader class of cofactors because it is _____.
organic
metal
All of these answers are correct.
inorganic
Which of the following occur at the point of saturation?
Both answers are correct
The reaction rate becomes faster
None of the answers are correct
The reaction rate plateau and reaches its maximum
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