Question

How are most eukaryotic genes controlled?

Answer 1

By enzymes and proteins

Explanation:

For example, gene expression is controlled in eukaryotes by the protein called Histone. Histone has a job: packaging DNA. It makes packaging by binding DNA and wounding it. In this way, the protein tightly condenses the part of DNA which is not planed to be used. These part of genetic material becomes unusable because it is very tightly packaged. However, when cell needs to express thightly condensed part of DNA, Histone and DNA unbound to form looser sturucture.

If genes are mostly used ones, they are loosely packaged.

In prokaryotes, Histone Like Proteins (HLP) exists to regulate gene expression.