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dna
Значение термина dna в knolik
dna - dna
dna - Deoxyribonucleic acid, a compound consisting of a large number of nucleotides attached together in single file to form a long strand. Usually two such strands are linked together parallel to each other by base pairing, and coiled into a helix. They may be separated ('melted' or 'denatured' DNA) by heat. Each nucleo-tide contains the sugar deoxyribose, and one of 4 different bases, 2 pyrimidine (thymine and cytosine) and 2 purine (adenine and guanine). It is now clear that DNA is the material of inheritance (See also: Gene) of almost all living things. It has the necessary great variety of structure, produced by different arrangements of the four different nucleotides. It passes on its structure to copies of itself, probably made by separating the two strands and forming a new matching strand, by base pairing with individual nucleotides, for each of the old strands (semi-conservative replication). Its structure is also translated into the structure of protein molecules when these are synthesized, by an elaborate mechanism involving RNA (See also: Messenger RNA). It is found mainly in the chromosomes of plants and animals and in the bacteria and viruses exclusively in corresponding structures.
Рядом со словом dna в knolik
| dizygotic twins | В начало буква "" буквосочетание "" | dominant |
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