In a bacterial cell the genes are free in the cytoplasm. In what cell structure are the genes in plant and animal
cells?

Nuclues

Explanation:

fun fact : What is the difference between a bacterial cell and an animal cell?

Nucleus: The most important difference between a bacterial cell and animal cell is that the bacterial cell does not have a membrane-enclosed nucleus. Instead, the bacterial cells keep its genetic material in an irregularly spaced region called nucleoid.

the binding of the substrate is dictated by the shape of each molecule. side chains on the enzyme interact with the substrate in a specific way, resulting in the making and breaking of bonds.