Question

How is the rate of enzyme catalysed reactions affected by 10${}^o$C rise of temperature?

• A. Doubles
• B. Becomes four times
• C. Halves
• D. Remains unchanged

Answer 1

Answer: (A)

Doubles

Most of the enzymes are protein molecules and extremes of temperature denature them. Optimum temperature range of enzymes is 20 to 30${}^o$C in most cases. The velocity of an enzyme catalyzed reaction doubles with 10${}^o$C rise in temperature. This is called as Q${}_{10}$ value. Within limits of the optimum temperature range, the Q${}_{10}$ value is 2-3.

So, the correct answer is option A.