Answer:
When a single amino acid is encoded by more than one codon.
Explanation:
Degeneracy is when a single amino acid is encoded by more than one codon. This pehonomenon was first described by Lagerkvist where there are more codons than amino acids that could be encoded.
The very primitive organism is the oldest because, over time, organisms gradually evolved into more complex organisms. First came the primitive organism, then it evolved into the more complex one, or the younger fossil.
Cholera is caused by the bacterium, Vibrio cholerae and produces CTX (cholera toxin, choleragen)...
Plasma membrane, Ribosomes, cytoplasm, and DNA.