DNA technology, recombinant
DNA technology, recombinant: A series of procedures used to join together (recombine) DNA segments. A recombinant DNA molecule is constructed (recombined) from segments from 2 or more different DNA molecules. Under certain conditions, a recombinant DNA molecule can enter a cell and replicate there, autonomously (on its own) or after it has become integrated into a chromosome.
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- DNA virus
DNA virus: A virus in which the genetic material is DNA rather than RNA. The DNA may be either double- or single-stranded. Major groups of double-stranded DNA viruses (class I viruses) include the adenoviruses, the herpes viruses, and the poxviruses. Major groups of single-stranded DNA viruses (class II viruses) include the parvoviruses and coliphages.
- DNA, coding
DNA, coding: A sequence of DNA that codes for protein. Coding DNA sequences are separated by long regions of DNA called introns that have no apparent function. Coding DNA is also known as an exon.
- DNA, mitochondrial
DNA, mitochondrial: Mitochondrial DNA (mtDNA) is the DNA of the mitochondrion, a structure situated in the cytoplasm of the cell rather than in the nucleus (where all the other chromosomes are located). All mtDNA is inherited from the mother. There are 2 to 10 copies of the mtDNA genome in each mitochondrion. mtDNA is a […]
- DNA, nongenetic
DNA, nongenetic: Through the marvelous medium of the Internet, we have discovered that DNA need not refer to deoxyribonucleic acid. Specifically, in an e-mail entitled ” A day in the life of a specialist registrar” from Glascow, Scotland we read that in gynecology outpatient clinic, the specialist registrar (resident in the U.S.) at “12:10 Sorted […]
- DNA, satellite
DNA, satellite: DNA that contains many tandem (not inverted) repeats of a short basic repeating unit. Satellite DNA is located at very specific spots in the genome (on chromosomes 1, 9, 16 and the Y chromosome, the tiny short arms of chromosomes 13-15 and 21 and 22, and near the centromeres of chromosomes).