Final answer:
The number of different polypeptides of 50 amino acids in length that can be made from the 20 common amino acids is approximately 1.1258999e+65.
Step-by-step explanation:
The number of different polypeptides of 50 amino acids in length that can be made from the 20 common amino acids can be calculated using the formula:
Number of possibilities = (number of amino acids)^length of polypeptide
In this case, the number of possibilities = 20^50.
Using a calculator, we find that the number of different polypeptides is approximately 1.1258999e+65.