Suppose that a certain enzyme is synthesized whenever the solution in which the cells aregrowing contains substance Y. When substance Y is not present, the enzyme is produced onlyunder certain environmental conditions. This phenomenon would most likely be an example of gene regulation

Inducible

Explanation:

When a gene is expressed only under certain conditions such as the presence of an inducer in the environment to inactivate the repressor, the gene expression is said to be inducible. Here, the presence of substance Y is required as it serves as an inducer by inactivating the repressor protein. When the repressor protein is inactivated, RNA polymerase is able to express the gene. This is an example of inducible gene expression. For example, the presence of lactose is required for the expression of genes of the lac operon.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.