10 Questions
What is a proenzyme?
Inactive form of enzyme that becomes active after partial proteolysis
What are the general features of isoenzymes?
Genetically determined differences in primary structure, catalyze the same reaction but are formed from structurally different polypeptides, may have different subcellular and tissue distribution, may be combined from more subunits, may differ in kinetic properties, are usually determined by electrophoresis
How are enzymes commonly measured?
In terms of their catalytic activity
What does it mean to measure the 'work' of an enzyme?
Measuring how much 'work' it performs, which is the rate at which it catalyzes the conversion of substrate to product
What is the difference between a true isoenzyme and a pseudoisoenzyme?
True isoenzymes are formed from structurally different polypeptides, whereas pseudoisoenzymes are formed from the same polypeptide but have undergone post-translational modification
Which characteristic is NOT a general feature of isoenzymes?
Are always found in the cytoplasm
What major way can various isoenzymes of an enzyme differ?
All of the above
What does it mean to measure the 'work' of an enzyme?
Measuring the rate at which it catalyzes the conversion of substrate to product
In terms of their catalytic activity, how are enzymes commonly measured?
Measuring the rate at which they catalyze the conversion of substrate to product
Which statement about proenzymes (zymogens) is true?
They become inactive after partial proteolysis
Test your knowledge of enzyme classification and isoenzymes with this quiz. Learn about proenzymes, isoforms, and isoenzyme general features.
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