... together to form a highly structured amyloid fiber
(see figure at left). The end of the fiber
acts as a template for the addition of free protein molecules, causing the fiber
to grow. Small differences in the amino acid ...
... is because the tension exerted by an individual skeletal (striated) muscle fiber
does not vary much, either from muscle to muscle, or with length. Each fiber
can exert a force on the order of 0.3 micronewtons. By this definition, ...
... ratio of ~40. The H1 histone stabilizes this structure. Beyond 30 nm fiber
the structure of chromatin is poorly understood, but it is classically suggested that the 30 nm fiber
is arranged into loops along a central protein scaffold to form ...
... An axon , or " nerve fiber
," is a long slender projection of a nerve cell, or " neuron ," which conducts electrical impulses away from the neuron's cell body or soma. ...
... trials have found no reduction in risk of subsequent adenomatous polyps of the colon in individuals who have had polyps resected taking dietary fiber
supplements compared with those receiving much lower amounts of supplemental wheat bran fiber. On the other hand, there is evidence from at least 1 ...
... respect to the DNA replication.
There are three levels of chromatin organization:
nucleosome - "beads on a string"
30 nm condensed chromatin fiber
Sperm chromatin is an exception to the above. During spermiogenesis, the male germ cell's chromatin is remodelled into a more tightly ...
... The outer segment of the rod photoreceptor cell in the human eye is connected to its cell body with a specialized non-motile cilium. The terminal fiber
of the olfactory neuron is also a non-motile cilium, where the odorant receptors locate. Almost all types of the mammalian cells have a single ...
... Two each of class H2A, H2B, H3 and H4 assemble to form one nucleosome , together with DNA. H1 is needed for histone-DNA-complexes to form a 30-nm fiber
, which packs the DNA even more tightly.
Histones act as spools around which DNA winds and they play a role in gene regulation.