Modify the rate of enzyme activity.

Explanation:

Cells can modify it, here is involve the energy ATP which is included in enzyme process, which can be regulated through the amount of carbohydrates included.

Nucleic Acids, don't regulate enzyme processes because their is saved genetic information that set all the rest.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

answer; i believe the correct answer is (a)0