The diagram below shows two amino acids  


a   Draw the result of these two amino acids forming a dipeptide  

The bond must be correct as shown here and link both amino acids(1) + H20(1)

b   Name the chemical reaction used to form the dipeptide  
    condensation (1)
c   Name the type of bond which links the two amino acids in the dipeptide  
    peptide (1)
d   State what the R shown in the amino acid diagrams refers to  
    a variable portion/group (1)
e   Describe how you perform a biochemical test to identify proteins  
  • add Biurets solution
  • lilac colour indicates presence of protein