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DNA and mRNA synthesis proceeds in the 5' to 3' direction. What do 5' and 3' refer to?


a) The position of the phosphate and nitrogen bases


b) The number of carbons in the nitrogen base


c) The number of hydroxyl groups attached


d) The position of a carbon atom in the sugar backbone

Respuesta :

In mRNA and DNA synthesis, there are rules that follows their production. One of such rules includes 5' - 3' direction to allow the production of this vital substances. This 5' to 3' direction is referred to d) The position of a carbon atom in the sugar backbone

In mRNA (transcription) synthesis and DNA (replication) synthesis, there is the need for their production to move in the 5' to 3' direction. This is a fundamental rule in their synthesis.

The 5' to 3 direction is also regarded as the orientation/position of carbon atoms in the nucleotides in particular the 5th and the 3rd carbon atoms in either the mRNA sugar (ribose) or the DNA sugar backbone (deoxyribose).

The end of the strand with an unlinked 5' carbon is the 5' end while that of the end with the unlinked 3' carbon is the 3' end.

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