In the genetic code

In the genetic code - In the genetic code, nucleotide...

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In the genetic code, nucleotide triplets specify amino acids. If the genetic code consisted of a single nucleotide or even pairs of nucleotides per amino acid, there would not be enough combinations (4 and 16, respectively) to code for all 20 amino acids. Triplets of nucleotide bases are the smallest units of uniform length that can code for all the amino acids. With a triplet code, three consecutive bases specify an amino acid, creating 4 3 (64) possible code words. The genetic instructions for a polypeptide chain are written in DNA as a series of nonoverlapping three-nucleotide words. During transcription, one DNA strand, the template strand , provides a template for ordering the sequence of nucleotides in an RNA transcript. o A given DNA strand can be the template strand for some genes along a DNA molecule, while for other genes in other regions, the complementary strand may function as the template. The complementary RNA molecule is synthesized according to base-pairing rules, except that uracil is the
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In the genetic code - In the genetic code, nucleotide...

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