Dna Diagram Gene. B dnmt1 is the maintenance dnmt and maintains dna methylation pattern during replication. Biologists in the 1940s had difficulty in accepting dna as the genetic material because of the apparent simplicity of its chemistry.
Rna is a single stranded molecule by contrast. The double helical structure of dna was introduced to the world by watson and crick and was identified by the use the x ray diffraction techniques to find out the three dimensional structure of dna. The genome can be divided into functional units called genes.
Dna is known for its double helix structure.
During gene expression the dna is first copied into rnathe rna can be directly functional or be the intermediate template for a protein that performs a function. Hydrogen bonds shown as dotted lines. A gene consists of several different regions. Genes the dna making up each chromosome is usually coiled up tightly.