NURSING EXAM QUESTIONS
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An enzyme reacts best at a certain pH.
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An enzyme reacts best at a certain temperature.
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An enzyme is able to react with only one substrate.
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An enzyme is able to react with many different substrates.
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Detailed explanation-1: -Enzyme structures react with their substrates. Enzymes’ unique active site allows it to fit with only one substrate<br>molecule.
Detailed explanation-2: -An enzyme’s substrate specificity is a property that enables the enzyme to bind only to the specific substrate. Both enzymes and substrates have complementary sites for binding, which is explained through the “lock and key” model of enzyme function.
Detailed explanation-3: -Absolute specificity-the enzyme will catalyze only one reaction.
Detailed explanation-4: -Each different type of enzyme will usually act on only one substrate to catalyse one biological reaction. Enzymes are specific because different enzymes have differently shaped active sites. The shape of the active site of an enzyme is complementary to the shape of its specific substrate .
Detailed explanation-5: -However, not all enzymes act only on a single substrate – substrate specificity is quite variable. Enzymes have usually evolved to catalyze one reaction, or a particular class of reaction, and the level of specificity will depend on the function of the particular enzyme.