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In: Biology

Amino acid are micro molecules which are associated with the formation of a macromolecule called protein....

Amino acid are micro molecules which are associated with the formation of a
macromolecule called protein. When an amino acid is kept in a solution it exists in the
ionic state. Answer the questions below related to amino acids
a. Draw the structure of amino acid and explain how the migration of groups in the amino
acid leads to formation of a structure with neutral ions. Define what ions are these;
(2.5 marks)
b. When an amino acid with equal number of ions is kept in two different solutions, one
at pH 3.5 and the other at pH 8.5, what will be the nature and charge on the amino acids.
Show equations to justify your answer. (2.5 marks)

Solutions

Expert Solution

(a) The structure of amino acid is simply a carbon atom carrying a hydrogen, a R- group , a -NH​​​​​​​​3+ group and a -COO​​​-​​-COO- group. Taking example of alanine (a diprotic amino acid), the whole part is explained as: (The ions are in the form of H+)

(b) Amino acid with equal number of ions means charge is zero i.e. it is in zwitterionic form. The question is explained here:

gladiator answered 2 years ago
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