Hox gene is an example of a homeobox gene. The homeobox sequence codes for a 60 amino acid protein domain known as the homeodomain. The main role of homeodomain is to act as a switch that controls gene transcription. See also: Hox gene.
Guanine /ËÉ¡wÉËnÉ¨n/ (G, Gua) is one of the four main nucleobases found in the nucleic acids DNA and RNA, the others being adenine, cytosine, and thymine (uracil in RNA). In DNA, guanine is paired with cytosine. With the formula C 5 H 5 N 5 O, guanine is a derivative of purine, consisting of a fused pyrimidine-imidazole ring system with conjugated double bonds. Being unsaturated, the bicyclic molecule is planar. The guanine nucleoside is called guanosine.
Base-pairing can occur between two strands of DNA, between two strands of RNA, or between one strand of DNA and one strand of RNA. Some Nucleic Acids are RNA, which stands for ribonucleic acid. RNA contains the nitrogenous bases Adenine, Cytosine, Guanine, and Uracil. All RNA is single-stranded (a single long chain of nucleotides). However, one section of the RNA molecule can base-pair with another section.