Question

What are epigenetic modifications?

the addition of reversible changes to histone proteins and DNA
the removal of nucleosomes from the DNA
the addition of more nucleosomes to the DNA
mutation of the DNA sequence

Answer 1

The addition of more nucleosomes to the DNA.

Step-by-step explanation:

Answer 2

This are epigenetic modification: a, b and c. (changes on histones, removal and nucleosomes formation.

Explanation:

Histone modification is a key step in genomic regulation. Activation of histones leads DNA to form new nucleosomes, which low transcription levels in this zone.

On the other hand, deactivation of histones removes those nucleosomes, permitting DNA to be transcripted.