The chromosomal region around which the nucleolus forms, a site of tandem repeats of the rRNA gene. The globular nuclear organelle formed at the nucleolar organizer. Site of ribosome construction. The substance of eukaryotic chromosomes consisting of proteins and nucleic acids. A sugar-base compound that is a nucleotide precursor.
Nucleotides are nucleoside phosphates.
A nitrogen base linked to a sugar molecule. Arrangement of DNA and histones forming regular spherical structures in eukaryotic chromatin . The membrane bound organelle containing the genome of eukaryotes organized into chromosomes . An allele whose effect is either an absence of normal gene product at the molecular level or an absence of normal function at the phenotypic level. The statistical hypothesis that states that there are no differences between observed and expected data.