Which enzyme listed in the table below is least efficient? Acetylcholinestrase C

Question

Which enzyme listed in the table below is least efficient? Acetylcholinestrase Carbonic anhydrase Catalase Crotonase Fumarase Which of the following statements regarding enzyme inhibitors is true? A reversible inhibitor typically deactivates an enzyme permanently. Irreversible inhibitors are often structural analogs of substrates or products. Reversible inhibitors are often used as therapeutic drugs. Reversible inhibitors cannot bind to the free enzyme. Potent toxins are generally reversible inhibitors.

Explanation / Answer

19) KM stands for Michaelis constant, it is a measure of substrate concentration required for effective catalysis to occur. kcat gives a direct measure of of the catalytic production of product under optimum condition.1/kcat = it is the time required by an enzyme molecule to turn over one substrate molecule, kcat is sometimes called turn over number

This kcat/Km= it is a measure of enzyme efficiency. larger the value of this ratio, higher is the enzyme efficiency or lower the value of ratio, lesser is the efficiency. Analysing the table it can be concluded that "Catalase " has the least efficiency among all.

correct option is (c)

20) correct option is c

A) Reversible inhibitors bind non covalently to enzymes, and many different types of inhibition can occur depending on what the inhibitors bind to. But reversible i nhibitors generally donot undergo chemical reactions when bound to the enzyme and can be easily removed on dilution or dialysis. so first option is false

B) Main role of irreversible inhibitors include modifying key amino acid residue neede dfor enzymatic activity.

C) Eg. monoamine oxidase A which is commonly used to fight depression and dysthmia.

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