What characterizes a thermolabile substance?

A thermolabile substance is one that is sensitive to heat and can be damaged or destroyed by even slight increases in temperature. This characteristic is particularly important in various biological and chemical contexts, such as enzyme activity, where excessive heat can denature proteins and render them inactive.

Understanding this nature of thermolabile substances highlights the importance of temperature control in laboratory settings and the handling of biological samples, as drastic alterations in temperature could lead to erroneous results or degradation of samples.

In contrast, options focusing on resistance to high temperatures or stating that a substance is unaffected by temperature changes do not accurately describe the properties of thermolabile substances.