Telomeres, which form the protective ends of eukaryotic chromosomes, are a ubiquitous and conserved structure of eukaryotic genomes but the basic structural unit of most telomeres, a repeated minisatellite motif with the general consensus sequence TnAmGo, may vary between eukaryotic groups.
The four fat-soluble vitamin groups are A, D, E, and K; they are related structurally in that all have as a basic structural unit of the molecule a five-carbon isoprene segment, which is Each of the fat-soluble vitamin groups contains several related compounds that have biological activity.
Mica minerals have a basic structural unit of the 2 1 layer type like pyrophyllite and talc, but some of the silicon atoms (ideally one-fourth) are always replaced by those of aluminum.
The discovery of Golgi cells led the German anatomist Wilhelm von Waldeyer-Hartz to postulate, and Ramón y Cajal to establish, that the nerve cell is the basic structural unit of the nervous system, a critical point in the development of modern neurology.
The basic structural unit of the chromate minerals is a tetrahedron formed from four oxygen atoms, each at one corner of a tetrahedron surrounding a central chromium atom; thus each CrO4 tetrahedron has a net electric charge of -2, which is neutralized by metal ions outside the tetrahedron.
On the other hand, six-membered ring is a basic structural unit of cristobalite and quartz.
The basic structural units of many nests are descending tunnels connecting flattened, generally horizontal chambers of oval to lobed outline.
The carbonized material was made up with basic structural units of carbonaceous layers having an average dimension of 2 4 nm and a wide interlayer distance of 0.4 nm.
Nucleosomes are the basic structural units of eukaryotic chromatin and their regulation is known to play a key role in regulation of gene expression.
Eukaryotic genomic DNA is packaged around octamers of histones to form the basic structural units of chromatin, the nucleosomes.
