Allowing the organism to adjust to changes in environmental conditions.
Explanation:
Gene may be defined as the functional segment of the DNA that codes for the particular protein and responsible for the genotype and phenotype expression of the organisms.
The gene expression of the particular genes can be modified according to the activity and the external environment of the organism. The altered expression of gene is important as it helps the prokaryotic organism to adapt better in their environment.
I believe Enthalpy is the scientific term for the changes. The specific changes each item listed undergoes is hard to say correctly without knowing the options. Could you list the answers to choose from so I can get a better understanding of what they want in the answer?