CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions With Solution 2021
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CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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Which moieties of nuclosides are involved in the formation of phophodiester linkages present in dinucleotides ? what does the would diester in the name of linkage indicate ? which acid is involved in the formation of this linkage ?
(a) -
What are glycosidic linkages ? In which type of biomolecules are they present ?
(a) -
Which monosaccharide units are present in starch, cellulose and glycogen and which linkages link these units ?
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How do enzymes help a substrate to be attacked by the reagent effectively ?
(a)
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CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions With Solution 2021 Answer Keys
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In the formation of dinucleotides, the 3' -OH group of one nucleotide unit and 5' -OH group of the other nucleotide molecule are involved to form the phosphodiester linkage.The acid involved in this linkage is phosphoric acid and the word diester in this linkage indicates that two -OH groups of phosphoric acid are involved in the formation of ester linkages.
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The ether linkages which connect the two molecules of a monosaccharide are called glycosidic linkages. These are present in oligosaccharides (i.e., disaccharides, trisaccharides, etc.) and polysaccharides.
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All these polysaccharides are made up of glucose units. In starch and glycogen, \(\alpha \)-glycosidic linkages are present while in cellulose, \(\beta \)-glycosidic linkages are present between glucose units.
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The active sites of enzymes hold the subsrate in a position so that can be attacked by the reagent effectively.
