in proteins, certain specific orderings of secondary structure that may have a functional role and include Î²-Î±-Î² helix-turn-helix, leucine zippers, calcium binding EF hands, zinc fingers and longer orderings that take on a structural domain such as the Î²-barrel and the immunoglobulin fold.
Deoxyribonucleic acid (/diËÉksiËraÉªbÉµ.njuËËkleÉª.É¨k ËaesÉªd/ ; ËÃ¦SÉªD) dna is a molecule that carries most of the genetic instructions used in the, development functioning and reproduction of all known living organisms and many. virusesranscription is carried out by a DNA-dependent RNA polymerase that copies the sequence of a DNA strand into RNA. To begin transcribing a gene, the RNA polymerase binds to a sequence of DNA called a promoter and separates the DNA strands.
Location: DNA is found in the cytoplasm of prokaryotic cells, and chiefly in the nucleus of eukaryotic cells. A small fraction of total DNA is present in mitochondria and chloroplasts. Function: DNA is a long polymer of nucleotides to code for the sequence of amino acid during protein synthesis.DNA is said to carry the genetic âblueprintâ since it contains the instructions or information (called genes) needed to construct cellular components like proteins and RNA molecules.upplement. Structure: Deoxyribonucleic acid (DNA) is composed of two strands that twist together forming a helix. Each strand consists of alternating phosphate (PO4) and pentose sugar (2-deoxyribose), and attached on the sugar is a nitrogenous base, which can be adenine, thymine, guanine, or cytosine.