When does mRNA editing take place?

After transcription, some RNA molecules are altered to contain bases not encoded in the genome. Most often this involves the editing or modification of one base to another, but in some organisms can involve the insertion or deletion of a base. Such editing events alter the coding properties of mRNA.

Explanation:

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Some cells alter the mRNA in a process known as RNA editing. RNA editing is the process of modifying RNA nucleotides to change the amino acid sequence. ... RNA editing can be used to modify the proteins made based on the conditions in the cell. It helps create diversity in protein products from a limited number of genes.

it has one origin of replication, but it proceeds in two directions - d)

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