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Mutations génétiques — Mutation (génétique) Pour les articles homonymes, voir mutation. Les mécanismes de l évolution biologique Mécanismes non aléatoires … Wikipédia en Français
Transition démocratique espagnole — Royaume d Espagne Reino de España es 1975 – 1982 … Wikipédia en Français
Transition (genetics) — Not to be confused with the evolutionary concept of a transitional fossil. In genetics, a transition is a point mutation that changes a purine nucleotide to another purine (A ↔ G) or a pyrimidine nucleotide to another pyrimidine (C ↔ T).… … Wikipedia
Genetic code — A series of codons in part of a messenger RNA (mRNA) molecule. Each codon consists of three nucleotides, usually representing a single amino acid. The nucleotides are abbreviated with the letters A, U, G and C. This is mRNA, which uses U (uracil) … Wikipedia
Point mutation — Illustration of three types of point mutations. A point mutation, or single base substitution, is a type of mutation that causes the replacement of a single base nucleotide with another nucleotide of the genetic material, DNA or RNA. Often the… … Wikipedia
DNA glycosylase — DNA glycosylases are a family of enzymes involved in base excision repair, classified under EC number EC 3.2.2. Base excision repair is the mechanism by which damaged bases in DNA are removed and replaced. DNA glycosylases catalyze the first step … Wikipedia
Base excision repair — (BER) is a cellular mechanism that repairs damaged DNA throughout the cell cycle. Repairing DNA sequence errors is necessary so that mutations are not propagated or to remove lesions that may lead to breaks in the DNA during replication.Single… … Wikipedia
Oxidative deamination — is a form of deamination that generates oxoacids in the liver. The presence of nitrous acid can cause transition mutations, by converting cytosine to uracil. Primarily occurs in the liver and kidneys.[1][2] Contents 1 In Urea cycle … Wikipedia
evolution — evolutional, adj. evolutionally, adv. /ev euh looh sheuhn/ or, esp. Brit., /ee veuh /, n. 1. any process of formation or growth; development: the evolution of a language; the evolution of the airplane. 2. a product of such development; something… … Universalium
radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… … Universalium
