Dna or deoxyribonucleic acid is the molecule that codes genetic information however dna cant directly order a cell to make proteins it has to be transcribed into rna or ribonucleic acid rna in turn is translated by cellular machinery to make amino acids which it joins together to form polypeptides and proteins overview of transcription.

Transcription and dna replication both involve making copies of the dna in a cell transcription copies the dna into rna while replication makes another copy of dna both processes involve the generation of a new molecule of nucleic acids either dna or rna however the function of each process is very different.

Bull dna polymerase starts to function from a 3 rsquo end of the dna strand while rna polymerase can start to function at anywhere of the dna strand from 3 rsquo end to 5 rsquo end direction related posts difference between gene and allele difference between a ribonucleotide and a deoxyribonucleotide difference between replication and transcription.

Dna polymerase is the enzyme responsible for adding the daughter nucleotides to the parent dna strand in order to help it get started.

The dna is unwound ahead of the transcription bubble and after the transcription complex has passed the dna rewinds thus during the elongation the rna polymerase uses the antisense strand of dna as template and synthesizes a complementary rna molecule.