question_answer

How many isomeric forms are possible for a tripeptide equally composed of L-valine, L-tyrosine and L-analine?

A)  3                            

B)  4                      

C)  6                    

D)  8

Correct Answer: C

Solution :

  Idea This problem includes conceptual mixing of formation of different tripeptide and their isomeric form. Problem can be solved by using the concept of formation of different isomeric forms of amines. Students are advised to write all possible composition of amino acid to get the correct number of isomeric forms. Different form of tripeptides are determined by different kinds of linkage between the different amino acid. Various possible isomers are Val-Tyr-Ala Tyr-Ala-Val Val-Ala-Tyr Ala-Tyr-Val Tyr-Val-Ala Ala-Val-Tyr TEST Edge JEE Main includes these types of questions very frequently so students are advised to identify of correct structural formula of amino acid. Sometimes sequence of amino acid with proper amino acid and their destruction using different amino acid are also asked.