Chemistry - Biomolecules Question with Solution | TestHub
An enzyme is kept at -10for 3 minutes and is used in a chemical reaction (P). It is then gradually brought to room temperature. It is now used in a chemical reaction (Q). Another enzyme is kept at 80for 5 minutes and is used in chemical reaction (R). It is then gradually brought to room temperature. It is now used in a chemical reaction (S). Which of these reactions will be catalyzed by enzyme and which will not?
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Answer:
Solution:
When an enzyme is kept at sub-zero temperature, it gets inactivated and it cannot catalyse the chemical reaction. Hence, P will not occur. When this enzyme is thawed (warmed) and brought back to normal temperature, the enzyme will become active and reaction Q will occur. However, when enzyme is heated beyond 60, it undergoes denaturation. The tertiary structure, which is absolutely essential for the activity of enzyme, is destroyed, and hence, reaction R will not occur. When this heated enzyme is cooled down, the tertiary structure cannot be regained back, and it is still non-functional. Hence, reaction S will not occur too.
