DNA

8 ENTRIES FOUND:

DNA

noun \ˌdē-ˌen-ˈā\

: a substance that carries genetic information in the cells of plants and animals

Full Definition of DNA

:  any of various nucleic acids that are usually the molecular basis of heredity, are constructed of a double helix held together by hydrogen bonds between purine and pyrimidine bases which project inward from two chains containing alternate links of deoxyribose and phosphate, and that in eukaryotes are localized chiefly in cell nuclei — compare recombinant dna

Illustration of DNA

Origin of DNA

deoxyribonucleic acid
First Known Use: 1944

Other Genetics Terms

chimera, hermaphrodite, plasticity

Rhymes with DNA

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DNA

noun \ˌdē-ˌen-ˈā\   (Medical Dictionary)

Medical Definition of DNA

: any of various nucleic acids that are usually the molecular basis of heredity, are constructed of a double helix held together by hydrogen bonds between purine and pyrimidine bases which project inward from two chains containing alternate links of deoxyribose and phosphate, and that in eukaryotes are localized chiefly in cell nuclei—called also deoxyribonucleic acid; see recombinant dna

Illustration of DNA

DNA

noun    (Concise Encyclopedia)

DNA double helix. A. Molecular model of DNA. The molecules include (1) hydrogen, (2) oxygen (3) …—© Merriam-Webster Inc.

One of two types of nucleic acid (the other is RNA); a complex organic compound found in all living cells and many viruses. It is the chemical substance of genes. Its structure, with two strands wound around each other in a double helix to resemble a twisted ladder, was first described (1953) by Francis Crick and James D. Watson. Each strand is a long chain (polymer) of repeating nucleotides: adenine (A), guanine (G), cytosine (C), and thymine (T). The two strands contain complementary information: A forms hydrogen bonds (see hydrogen bonding) only with T, C only with G. When DNA is copied in the cell, the strands separate and each serves as a template for assembling a new complementary strand; this is the key to stable heredity. DNA in cells is organized into dense protein-DNA complexes (see nucleoprotein) called chromosomes. In eukaryotes these are in the nucleus, and DNA also occurs in mitochondria and chloroplasts (if any). Prokaryotes have a single circular chromosome in the cytoplasm. Some prokaryotes and a few eukaryotes have DNA outside the chromosomes in plasmids. See also Rosalind Franklin; genetic engineering; mutation; Maurice Wilkins.

Variants of DNA

DNA or deoxyribonucleic acid

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