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प्रश्न
Define the following as related to proteins:
Peptide linkage
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उत्तर
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.
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संबंधित प्रश्न
What is peptide linkage?
What type of bonding helps in stabilising the α-helix structure of proteins?
Differentiate between the following:
Fibrous proteins and Globular proteins
Write one difference between α-helix and β-pleated structures of proteins.
The protein responsible for blood clotting is ____________.
The helical structure of protein is stabilized by:
Which of the following statement is correct:
Proteins can be classified into two types on the basis of their molecular shape i.e., fibrous proteins and globular proteins. Examples of globular proteins are:
(i) Insulin
(ii) Keratin
(iii) Albumin
(iv) Myosin
In fibrous proteins, polypeptide chains are held together by:
(i) van der Waals forces
(ii) disulphide linkage
(iii) electrostatic forces of attraction
(iv) hydrogen bonds
Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form, is subjected to a physical change like change in temperature or a chemical change like, change in pH, denaturation of protein takes place. Explain the cause.
Explain the terms primary and secondary structure of proteins. What is the difference between α-helix and β-pleated sheet structure of proteins?
Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be ______.
Out of the following, which type of interaction is responsible for the stabilisation of the α-helix structure of proteins?
The correct structure of Ruhemann's Purple, the compound formed in the reaction of ninhydrin with proteins is:
