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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

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

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प्रश्न

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.

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उत्तर

Due to physical or chemical change, hydrogen bonding and various other attractive forces are disturbed, globules unfold and helix gets uncoiled to form a thread like molecule. Therefore, secondary and tertiary structure of protein loses all or part of their biological activity. This is called denaturation of proteins.

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पाठ 14: Biomolecules - Multiple Choice Questions (Type - I) [पृष्ठ २११]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 14 Biomolecules
Multiple Choice Questions (Type - I) | Q 48 | पृष्ठ २११

संबंधित प्रश्‍न

Discuss the optical activity of lactic acid.


Write one difference between α-helix and β-pleated structures of proteins.


The correct statement for protein haemoglobin.


Which functional group participates in disulphide bond formation in proteins?


Which of the following statement is correct:


Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present?


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


α-Helix is a secondary structure of proteins formed by twisting of polypeptide chain into right-handed screw like structures. Which type of interactions are responsible for making the α-helix structure stable?


Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides? What does the word diester in the name of linkage indicate? Which acid is involved in the formation of this linkage?


Assertion: β-glycosidic linkage is present in maltose,

Reason: Maltose is composed of two glucose units in which C–1 of one glucose unit is linked to C–4 of another glucose unit.


Explain the terms primary and secondary structure of proteins. What is the difference between α-helix and β-pleated sheet structure of proteins?


The main structural feature of proteins is


Out of the following, which type of interaction is responsible for the stabilisation of the α-helix structure of proteins?


An α-helix is a structural feature of ______.


What is the effect of denaturation on the structure of proteins?


Write a classification of proteins with an example.


Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (Nterminal).

Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of a type and two subunits β type.)

In the light of the above statements, choose the correct answer from the options given below:


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