![]() In RNA, uracil (U) substitutes for thymine. Four different ~s are found in DNA: adenine (A), cytosine (C), guanine (G) and thymine (T). ![]() The substitution, in duplex DNA, of one pair of nucleotides for another, or the reversal of a pair of nucleotides with respect to the strands in which the two individual nucleotides reside.Ī key component of DNA and RNA molecules. the production of living organisms from other living organisms. any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water.īiogenesis. The DNA molecule is a chain of nucleotides each consisting of a backbone made of a sugar and a phosphate group, with a nitrogenous ~ attached. ~: The information coding part of DNA, the letters of the genetic code. ~ A substance that lowers the hydrogen ion concentration in a solution.īasidia Specialized club-shaped structures on the underside of club fungi (Basidiomycetes) within which spores form (sing.: basidium). Commonly used interchangeably with nucleotide pair. A pair of nitrogenous ~s (usually one purine and one pyrimidine) held together by hydrogen bonds in a double-stranded region of nucleic acid molecule. Growth of bacteria in a fixed volume of liquid medium in a closed vessel, with no additions or removals made during the period of incubation. ~ sequence: The order of ~s in a DNA molecule.Ī mutation resulting in the replacement of one ~ for a different ~. In a DNA molecule, adenine always bonds with thymine (A-T), and cytosine always bond s with guanine (C-G). ~ pair: Two of the building blocks of DNA held together by weak bonds. In the DNA molecule, they are linked to one another in pairs of long chains, where each member of the pair is complementary to the other. ~: one of the four nitrogenous subunits (nucleotides) of DNA: adenine (abbreviated as A), guanine (G), cytosine (C), and thymine (T). maturation, a higher rate of energy metabolism, and superior. both Penn State and the University of Helsinki, has. James Marden, a professor of biology at Penn State. of "exploratory" butterflies that colonized new habitats differ genetically. Variation in orientation of ~s in a DNA double helix that permits some tilting of the ~s. (Figure 4-4b)Ī mutational event in which one ~ pair substitutes for another U) and guanine pairs with cytosine (G♼). ![]() In DNA, specifically, adenine only pairs with thymine to form two hydrogen bonds.Īssociation of two complementary nucleotides in a DNA or RNA molecule stabilized by hydrogen bonding between their ~ components. In complimentary pairing, one purine links with one pyrimidine nucleic base. Watson & Crick base pairs follow a specific rule of hydrogen bonding. A type of mutation involving replacement or substitution of a single nucleotide base with another in DNA or RNA molecule.
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