1. Which of the following is NOT a biological advantage of enzyme cascades? the
ID: 61410 • Letter: 1
Question
1.
Which of the following is NOT a biological advantage of enzyme cascades?
the ability to respond rapidly to a stimulus
the ability of a reaction or process to respond to widely different stimuli
the ability to amplify a signal greatly
2.
On what basis are enzymes and proteins with allosteric properties different from those without allosteric properties?
on the basis of their different dependence on substrate concentration.
on the basis of having more than one subunit.
on the basis of having different responses to non-substrate molecules such as inhibitors.
3.
Protein kinases generally regulate the activity of target proteins by transferring a phosphate group from ATP to what kind of functional group on the target protein?
hydrophobic groups
carboxyl groups
hydroxyl groups
4.
A heterotropic activator will have what effect on a sigmoidal kinetic plot (v vs. [S])?
The curve will shift to the right.
The curve will shift to the left.
The curve will become more sigmoidal (the first half will be decreased and the second half increased).
5.
The allosteric properties of both ATCase and hemoglobin have which of the following in common?
Both experience changes in quaternary structure on the binding of small molecules.
Both are regulated by end-product or feedback inhibition.
The allosteric properties in each case are due to dissociation of ATCase and hemoglobin into their respective subunits.
6.
Enzymes that catalyze the same reaction but differ in amino acid sequence are called
allozymes.
isozymes.
zymogens.
7.
Enzymes that are activated by specific proteolytic cleavage are called
isozymes.
allosteric.
zymogens.
8.
The effects of molecules other than substrate on allosteric enzymes are called
homotropic effects.
allosteric effects.
heterotropic effects.
9.
The inhibition of aspartate transcarbamylase by CTP is an example of what kind of inhibition?
feedback inhibition
inactivation by phosphorylation
competitive inhibition
1.
Which of the following is NOT a biological advantage of enzyme cascades?
the ability to respond rapidly to a stimulus
the ability of a reaction or process to respond to widely different stimuli
the ability to amplify a signal greatly
2.
On what basis are enzymes and proteins with allosteric properties different from those without allosteric properties?
on the basis of their different dependence on substrate concentration.
on the basis of having more than one subunit.
on the basis of having different responses to non-substrate molecules such as inhibitors.
3.
Protein kinases generally regulate the activity of target proteins by transferring a phosphate group from ATP to what kind of functional group on the target protein?
hydrophobic groups
carboxyl groups
hydroxyl groups
4.
A heterotropic activator will have what effect on a sigmoidal kinetic plot (v vs. [S])?
The curve will shift to the right.
The curve will shift to the left.
The curve will become more sigmoidal (the first half will be decreased and the second half increased).
5.
The allosteric properties of both ATCase and hemoglobin have which of the following in common?
Both experience changes in quaternary structure on the binding of small molecules.
Both are regulated by end-product or feedback inhibition.
The allosteric properties in each case are due to dissociation of ATCase and hemoglobin into their respective subunits.
6.
Enzymes that catalyze the same reaction but differ in amino acid sequence are called
allozymes.
isozymes.
zymogens.
Explanation / Answer
1. the ability to amplify a signal greatly
2. on the basis of having different responses to non-substrate molecules such as inhibitors.
3. hydroxyl groups
4. The curve will become more sigmoidal (the first half will be decreased and the second half increased
5. Both are regulated by end-product or feedback inhibition.
6. isozymes.
7. zymogens.
8. heterotropic effects
9. feedback inhibition
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