Final answer:
Histone acetylation, increased attraction between DNA and histones, and chromatin remodeling complexes all increase gene expression.
Step-by-step explanation:
Histone acetylation, increased attraction between DNA and histones, and chromatin remodeling complexes all increase gene expression. Acetylation of histones, catalyzed by histone acetyltransferases (HATs), results in the loosening of nucleosomes and opening of the underlying DNA for transcription. Increased attraction between DNA and histones also leads to gene expression, as it allows transcription factors to bind to DNA more easily. Additionally, chromatin remodeling complexes play a role in changing the shape of chromatin, silencing some genes and activating others.