Biology Help (Life) !!!!!!!!?

Question

Just 2 questions that I have been trying to figure out for about 3 hours now!!!

1. The mean Mr (relative molecular mass) of an amino acid is 110. The Mr of a particular protein is 40 000. Calculate the number of amino acids that make up this protein! Please can you show me how to answer this question!!!

2. How is it possible for different proteins to have the same relative molecular mass?

Answer 1

1. The protein consists of many amino acids joined together with peptide bonds.  Therefore, if the average mass of the amino acids is 110 and the mass of the protein is 40,000, then 40,000/110 gives you the number of amino acids = 364.

2.  There are a few different ways.  First, because the different amino acids have different masses, the proteins could have different combinations of amino acids to make up the same mass.  But, even if they had the same amino acids, they could have them in different arrangements which would create different proteins.