Definitions [3]
Define the following term:
Essential amino acids
Amino acids that cannot be synthesised in the human body and must be obtained through diet are known as essential amino acids.
Define Zwitter ion
An ∝-amino acid molecule contains both acidic carboxyl (-COOH) group as well as basic amino (-NH2) group. Proton transfer from acidic group to basic group of amino acid forms a salt, which is a dipolar ion called zwitter ion.
Define the following as related to proteins:
Peptide linkage
Chemically, peptide linkage is an amide formed between the –COOH group and –NH2 group. The reaction between two molecules of similar or different amino acids proceeds through the combination of the amino group of one molecule with the carboxyl group of the other. This results in the elimination of a water molecule and the formation of a peptide bond –CO–NH–. The product of the reaction is called a dipeptide because it is made up of two amino acids.
For example, when the carboxyl group of glycine combines with the amino group of alanine, we get a dipeptide, glycylalanine.
Important Questions [17]
- What Are Amino Acids?
- Write the Correct Reaction for Formation of Peptide Bond Between Amino Acids
- How is Peptide Linkage Formed?
- Write a classification of proteins with an example.
- Discuss the Optical Activity of Lactic Acid.
- Explain formation of peptide linkage in protein with an example.
- What is peptide linkage?
- How is tripeptide formed?
- How Are Proteins Classified on the Basis of Molecular Shapes?
- What are enzymes?
- Define Enzymes
- State the Function of Insulin.
- Write the Structure of Simple Triglycerides.
- The Secondary Structure of Protein is Determined by
- Mention 'Two' Functions of Lipids
- Define Complex Lipids
- What Are Hormones?
