The number of tripeptides formed by three different amino acids is:

The number of tripeptides formed by three different amino acids having three different amino acids is

The number of tripeptides formed by three amino acids: glycine, alanine and serine is

The number of tripeptides formed by three amino acids : glycine, alanine and serine is :

The number of possible dipeptides formed with two amino acids A and B are

(a) Let the letters A and B represent two different amino acids. Write down the sequences of all the possible tripeptides that could be made with just these two amino acids. (b) What is the formula for calculating the number of different tripeptides that can be formed from two different amino acids ?

The number of essential amino acids is: