Nuclear pores
The nuclear envelope is composed of two membranes joined at regular intervals to form
circular openings called nuclear pores.
Nucleic acid probe
In DNA technology, a labeled single-stranded nucleic acid molecule used to tag a specific
nucleotide sequence in a nucleic acid sample. Molecules of the probe hydrogen-bond to the
complementary sequence wherever it occurs; radioactive or other labeling of the probe
allows its location to be detected.
Nucleoid
A dense region of DNA in a prokaryotic cell.
Nucleoid region
The region in a prokaryotic cell consisting of a concentrated mass of DNA.
Nucleolus
A specialized structure in the nucleus, formed from various chromosomes and active in the
synthesis of ribosomes.
Nuclear sap/nucleoplasm
Similar to the cytoplasm of a cell, the nucles contains nuclear sap or nucleoplasm. The
nucleoplasm is one of the types of protoplasm, and it is enveloped by the nuclear
membrane or nuclear envelope.
Nucleoproteins
Any of a group of complexes composed of protein and nucleic acid and found in the nucle
and cytoplasm of all living cells, as in chromatin and ribosomes.
Nuleoplasm
The protoplasm that constitutes the nucleus of a cell. Or The jellylike material within a cell
nucleus, containing the nucleolus and chromatin.
Nucleoside
An organic molecule consisting of a nitrogenous base joined to a five-carbon sugar.
Nucleosome
The basic, beadlike unit of DNA packaging in eukaryotes, consisting of a segment of DNA
wound around a protein core composed of two copies of each of four types of histone.
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