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