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Okazaki fragments:
Short lengths of DNA produced on the lagging strand during DNA
replication, discovered by R. Okazaki. They are rapidly joined
by DNA ligase to form a continuous DNA strand.
oligodendrocyte:
Type of glial cell in the vertebrate central nervous system
that forms a myelin sheath around axons.
oligomer:
Short polymer, usually consisting (in a cell) of amino acids (oligopeptides),
sugars (oligosaccharides), or nucleotides (oligonucleotides).
(From Greek oligos, few, little.)
oncogene:
One of a large number of genes that can help make a cell cancerous.
Typically, a mutant form of a normal gene (proto-oncogene) involved
in the control of cell growth or division.
oocyte:
Developing egg; usually a large and immobile cell.
oogenesis:
Formation and maturation of oocytes in the ovary.
operator:
Short region of DNA in a bacterial chromosome that controls
the transcription of an adjacent gene.
operon:
In a bacterial chromosome, a group of contiguous genes that
are transcribed into a single mRNA molecule.
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