Final answer:
The peptide 'CHKKCH' can be coded in 64 different ways since each amino acid (cysteine, histidine, and lysine) can be encoded by two different codons and there are six amino acids positions in the peptide.
Step-by-step explanation:
If there are two different ways to code for the amino acids cysteine (C), histidine (H), and lysine (K), we need to calculate the number of ways the peptide "CHKKCH" can be coded. Given that the genetic code is redundant and that amino acids can be encoded by more than one nucleotide triplet, we account for the variance in codons for each amino acid. Cysteine is encoded by UGU and UGC codons, histidine by CAC and CAU, and lysine by AAA and AAG. For the peptide sequence CHKKCH, there would be a multiplication of the number of codons for each amino acid position.
For cysteine, this gives us 2 possibilities each (at positions 1 and 6), for histidine, there are also 2 possibilities (at position 2), and for lysine, we have 2 possibilities each (at positions 3, 4, and 5). So the calculation for the total number of distinct ways to code the peptide would be:
2(Cys) × 2(His) × 2(Lys) × 2(Lys) × 2(Lys) × 2(Cys) = 26 = 64 ways.