Each DNA molecule consists of two chains of nucleotides that connect to one another like a ladder. Then, the whole molecule is twisted to form a double helix. The connections between the two strands are formed between the nucleotides (A, T, C, and G). A and T always bond to one another, as do C and G.
During transcription, the two chains are "unzipped" or separated to allow mRNA to form. Transcription happens when the four bases of RNA (A, U, C, and G) bond to their DNA counterparts. This works exactly the same as it does between the two strands of DNA. The only difference is that since RNA does not have the T base, it uses U instead.
The reason that the ease and accuracy of this process is so important to genetic information is that without accurate copies of the DNA, proteins would either be improperly assembled or not at all. No organism could survive without the proper proteins.
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