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
helps an enzyme perform a function
is a metal ion
is one of the enzymes performing the function
Which of the following statements is true about cofactors?
Cofactors are required for some enzymes to function
All of the answers are correct
Coenzymes are a specific type of cofactor
Cofactors increase the rate of reaction
What type of bond is often formed between prosthetic groups and proteins?
Hydrogen
Amino acid
Covalent
Metal
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 oxygen enters the cell
The process through which food is converted to energy inside
The process through which food enters the cell
A coenzyme is differentiated from the broader class of cofactors because it is _____.
inorganic
metal
organic
All of these answers are correct.
Many coenzymes are derived from _____.
inorganic molecules
vitamins
metals
All of these answers are correct.
An enzyme will reach its saturation point
when it is at an optimum temperature
when it is at an optimum pH
when no more substrates are available
when no more enzyme is available to work on substrates
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
None of the answers are correct
The enzyme will denature and stop working
The following conditions can denature an enzyme
extreme temperature only
increased substrate concentration only
extreme temperature and extreme pH
extreme pH and increased substrate concentration
An increase in temperature
Changes the shape of the substrate
Provides shape to an enzyme
Increases the likelihood a enzyme and substrate will collide
Increases substrate concentration
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
Pepsin works optimally in your stomach due to its
Acidic pH
high temperature
basic pH
low 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
What is the main function of an inhibitor?
Increase the rate of reaction
Disrupt an enzyme's activity
Decrease the rate of reaction
Positively regulate an enzyme's activity
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
Competitive inhibition involves an inhibitor
Binding away from the location
Initiating enzyme function
Binding to the active site
Recognizing a substrate
