How Genes Are Expressed
RNA differs from DNA in these ways:
(1) the pentose sugar is ribose, not deoxyribose;
(2) the base uracil replaces thymine;
(3) RNA is single stranded.
The central dogma of molecular biology says that (1) DNA is a template for its own replication and also for RNA formation during transcription, and (2) the complementary sequence of nucleotides
in mRNA directs the correct sequence of amino acids of a polypeptide during translation.
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