When DNA is compacted by histones into 10-nm and 30-nm fibers, the DNA is unable to interact with proteins required for gene expression. Therefore, to allow for these proteins to act, the chromatin must constantly alter its structure. Which processes contribute to this dynamic activity?
A) DNA supercoiling at or around H1
B) methylation and phosphorylation of histone tails
C) hydrolysis of DNA molecules where they are wrapped around the nucleosome core
D) accessibility of heterochromatin to phosphorylating enzymes
E) nucleotide excision and reconstruction
The importance of histones and scaffolding proteins in the compaction of eukaryotic chromosomes.
Muscle fibers consist of single, elongated, multinucleated cells that arise from the fusion
Preload is related to the amount of blood and stretching of the ventricular myocardial fibers
Chromatin fibers characteristic of the interphase nucleus
Ragged-red fibers in skeletal muscle cells
Opener Chromatin fibers spilling out of a chicken erythrocyte