Can cell repiration occur in organism at a temp above 65 deg centigrade - give reason?

Answer 1

The rate of any reaction depends on the active masses of the reactants, the pH and the temperature. This applies to the biological reactions involving enzymes like cellular respiration

The enzymes in general get more and more active as the temperature increases. This would be true till the temperature reaches up to 45 degree Celsius (in general for humans). Above which some enzymes denature and their activity completely drops off. This temperature is variable and is dependent on the enzyme. (A few enzymes are active even at high temperatures). But at 65 degree Celsius most of the intracellular enzymes are denatured.

So as the temperature increases, the cellular respiration increases up to a certain point and then there is a sharp decline so at or after 65 degree Celsius cellular respiration is virtually impossible.

Answer 2

Cellular respiration stops occurring or slows down significantly in organisms at temperatures above 65 degrees Celsius because the enzymes involved in the process denature at such high temperatures. Enzymes are protein molecules that facilitate the various chemical reactions involved in cellular respiration, and their structure can be irreversibly altered by excessive heat, rendering them ineffective. Thus, the metabolic processes dependent on these enzymes are disrupted, leading to a halt in cellular respiration.