A codon is a series of three nucleotides which code for a specific amino acid in protein biosynthesis.
Most of the standard 20 amino acids have several different codons that encode for a single amino acid.
For RNA strands, the four different available nucleotide bases are A (adenine), G (guanine), U (uracil), and C (cytosine).
There are six codons that represent serine: UCU, UCC, UCA, UCG, AGU, AGC.
For the corresponding DNA strands, substitute T (thymine) for U. In double stranded DNA, A always pairs with T, and G always pairs with C.
Correct option is C)
Serine is an amino acid which is proteinogenic amino acid. Its codons in the genetic code are UCU, UCC, UCA, UCG, AGU and AGC
So, the correct answer is 'UCU, UCC, UCA and UCG'