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

Optical rotations of some compounds along with their structures are given below which of them have D configuration.

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प्रश्न

Optical rotations of some compounds along with their structures are given below which of them have D configuration.

(I)
(II)
(III)

विकल्प

  • I, II, III

  • II, III

  • I, II

  • III

MCQ
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उत्तर

I, II, III

Explanation:

I, II and III structures have D configuration with –OH group on the lowest asymmetric carbon is on the right side which is comparable to (+) glyceraldehyde.

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अध्याय 14: Biomolecules - Multiple Choice Questions (Type - I) [पृष्ठ २०६]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 14 Biomolecules
Multiple Choice Questions (Type - I) | Q 17 | पृष्ठ २०६

संबंधित प्रश्न

How are proteins classified on the basis of molecular shapes?


How is tripeptide formed?


Discuss the optical activity of lactic acid.


What are the common types of secondary structure of proteins?


Differentiate between the following :

Peptide linkage and Glycosidic linkage 


Which functional group participates in disulphide bond formation in proteins?


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


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.


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


Presence of disulphide link gives rise to which structure of protein?


An α-helix is a structural feature of ______.


Assertion (A): Proteins are polymers of α-amino acids connected by a peptide bond.

Reason (R): A tetrapeptide contains 4 amino acids linked by 4 peptide bonds.


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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