AP Biology: Ch.18 Review Activity Crossword

Small, positively charged proteins that attract negatively charged DNA. DNA then coils around it very tightly.
Double stranded DNA between two nucleosomes. The string in the "Beads and string" analogy.
The fundamentasubunit of a chromatin. Each is a piece of DNA wrapped around a histone.
The basic structural unit of DNA associated with replication , gene expression, and packaging.
Regions of DNA found at the histone.
Lightly packaged form of chromosomes enriched in genes. Generally under active transcription.
How cells differ to perform specific tasks.
DNA wraps around 8 histones twice. Then forms tight coils.
AN epigenetic mechanism used to control gene expression. Adding a methyl group to turn a gene "off".
An epigenetic mechanism used to control gene expression. The unwrapping of DNA from around a histone to create loose coils.
When certian genes are expressed in a parent-of-origin specific manner. One allele is imprinted upon, silencing it.
A region of DNA adjacent to or within a gene that controls gene expression through the binding of transcription factors.
A protein that enhances gene expression. Most are bound to enhancers.
A protein that reduces gene expression by binding to the operon at the activator site.