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The Collaborative International Dictionary
deoxyribonucleic acid

deoxyribonucleic acid \deoxyribonucleic acid\ n. a nucleic acid, usually of very high molecular weight, consisting of a linear sequence of monomer units of deoxyribonucleotides, occurring in most organisms in pairs of strands, wound together in the form of a double helix; it is the main component of chromosomes and contains the genetic information which is the basis of heredity, transmitted from parent to progeny, and found in all living organisms except for certain viruses which have RNA as their basic genetic material; -- usually referred to by the acronym DNA.

Syn: DNA, desoxyribonucleic acid.

Note: The monomer units making up the DNA each contain one of four heterocyclic bases: thymine, adenine, cytosine, or guanine. The genetic information is contained in the precise sequence of these monomer units, which ultimately specify the sequence of proteins to be made by the organism's biosynthetic processes, mediated through the synthesis of RNA having a base sequence corresponding to that of the DNA. The DNA sequence also specifies the sequence of the various RNA molecules the RNA base sequence being a copy of that on one of the DNA strands. Most of the RNA synthesized is involved in protein synthesis. In the double-helical form of DNA, the thymine on one strand is paired with the adenine on the opposite strand, and cytosine of one strand is paired with guanine on the opposite strand. There is in DNA also certain controlling information concerning the timing and amount of RNA to be made, encoded within the sequence of the DNA in ways that are still being elucidated. When this structure is replicated in the course of cell multiplication, two identical double-helical molecules are formed, each containing one strand from the original molecule. Each resulting molecule is distributred to either the parent or progeny organism, and this is the basic mechanism for transmission of hereditary information. In RNA-based viruses, or those having single strands of DNA (as certain viruses), the genetic information transmission occurs through a double-stranded intermediate by a similar mechanism. In some organisms slight modifications of the bases of DNA are found, such as methylcytosine or, in some viruses, uracil or hydroxymethyluracil; these unusual bases act analogously to the normal bases in their genetic coding function. A small percentage of methylcytosine is found in many organisms, and it serves in some cases as a special signal, as for restriction enzymes.

Douglas Harper's Etymology Dictionary
deoxyribonucleic acid

1931; see deoxyribose.

deoxyribonucleic acid

n. (context genetics biochemistry English) A nucleic acid found in all living things (and some non-living, see virus); consists of a polymer formed from nucleotides which are shaped into a double helix; it is associated with the transmission of genetic information.

deoxyribonucleic acid

n. (biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information; "DNA is the king of molecules" [syn: desoxyribonucleic acid, DNA]

Usage examples of "deoxyribonucleic acid".

The process involves the isolation and comparison of fragments of DNA-deoxyribonucleic acid-the basic building block of the chromosome.

The precise assembly of the amino acids into the appropriate sequence depends on another giant molecule in the cell, ribonucleic acid (RNA), whose synthesis is in turn directly under the control of the cell's genetic material, deoxyribonucleic acid, DNA.

This can be either Ribonucleic acid (RNA) or Deoxyribonucleic acid (DNA).

The acronym for deoxyribonucleic acid, which encodes genetic information.

With a few unimportant exceptions, the hereditary nucleic acid is always the molecule called DNA (deoxyribonucleic acid).

Bundles of data, protein chains called deoxyribonucleic acid, order the birth, growth, and to an extent, the behavior of organic machines which carry it prior to its self-replication.

Jason was well aware that deoxyribonucleic acid, better known as DNA, was a molecule, shaped like a twisted, double-stranded string.

Let one of them, a strong and sturdy one, reach his microscopic goal and pierce that cell wall and join his helical deoxyribonucleic acid to hers and make a baby on our very first try, so I don't have to go through all of this again.