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 a metal ion
is one of the enzymes performing the function
helps an enzyme perform a function
is bound tightly to the enzyme
Which of the following statements is true about cofactors?
Coenzymes are a specific type of cofactor
All of the answers are correct
Cofactors increase the rate of reaction
Cofactors are required for some enzymes to function
What type of bond is often formed between prosthetic groups and proteins?
Covalent
Metal
Amino acid
Hydrogen
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 is converted to energy inside
The process through which oxygen is converted to energy
The process through which food enters the cell
A coenzyme is differentiated from the broader class of cofactors because it is _____.
organic
inorganic
All of these answers are correct.
metal
Many coenzymes are derived from _____.
metals
All of these answers are correct.
vitamins
inorganic molecules
An enzyme will reach its saturation point
when no more enzyme is available to work on substrates
when it is at an optimum temperature
when no more substrates are available
when it is at an optimum pH
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
None of the answers are correct
The enzyme will denature and stop working
The enzyme will continue working normally
The following conditions can denature an enzyme
extreme pH and increased substrate concentration
extreme temperature and extreme pH
increased substrate concentration only
extreme temperature only
An increase in temperature
Increases substrate concentration
Provides shape to an enzyme
Changes the shape of the substrate
Increases the likelihood a enzyme and substrate will collide
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
neutral pH
extremely high temperature
more enzyme
Pepsin works optimally in your stomach due to its
basic pH
low temperature
high temperature
Acidic pH
Which of the following occur at the point of saturation?
The reaction rate plateau and reaches its maximum
None of the answers are correct
Both answers are correct
The reaction rate becomes faster
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
Which of the following is NOT true of a noncompetitive inhibitor?
It is possible for a substrate to still bind to the enzyme
The reaction may be completely prevented
The inhibitor can bind in the active site
The enzyme active site can change shape
Competitive inhibition involves an inhibitor
Binding to the active site
Initiating enzyme function
Binding away from the location
Recognizing a substrate
