Dna Strand Diagram. Before transcription can take place the dna double helix must unwind near the gene that is getting transcribed. The phosphate group on one nucleotide links.
Dna replication in prokaryotes is formed when an enzyme named helicase separates the dna strands at the origin of replication. The below mentioned article provides a diagram of dna strand. A molecule of dna consists of two strands that form a double helix structure.
Nitrogenous bases in terms of the nitrogenous bases the bases are different depending on whether or not the nucleotide is rna or dna.
Chromosomal dna consists of two dna polymers that make up a 3 dimensional 3d structure called a double helix. Adenine a cytosine c guanine g or thymine t. From this backbone extend the bases. The topoisomerase breaks dna s phosphate backbone ahead of the replication fork.