Cellular genomes are always dsDNA.
Transcription is the initial step in the production of genes, which are double-stranded DNA molecules in all biological organisms (some viruses have single-stranded DNA genomes and some have RNA genomes).
Long stretches of double-stranded DNA are crammed closely together into organelles called chromosomes in order to fit within the cell more comfortably. Two polynucleotide chains, each of which has a nitrogenous base bonded to a hydrogen atom by a hydrogen bond, make up double-stranded DNA.
Because of the anti-parallel sugar-phosphate backbone orientation and the complementary nature of the A-T and C-G base pairing, one strand in this arrangement replicates the other.
Here is another question with an answer similar to this about double-stranded DNA genomes: https://brainly.com/question/14353558
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