Question

A pentapeptide consisting of amino acids with molecular weights of 165, 131, 75, 204 and 146 Da has an approximate molecular weight (in Da) of ..........

Hint:

To find the molecular weight of a peptide, simply add the molecular weights of the constituent amino acids.

Answer 1

Correct Answer: 648

Step 1: Add the molecular weights of the amino acids.
The molecular weights of the individual amino acids are given as 165, 131, 75, 204, and 146 Da. To find the approximate molecular weight of the pentapeptide, we sum these values: \[ 165 + 131 + 75 + 204 + 146 = 721 \, \text{Da}. \]

Step 2: Conclusion.
The approximate molecular weight of the pentapeptide is 721 Da.