7_Carbohydrates

7_Carbohydrates - VII VII Carbohydrates Carbohydrates The...

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V V V I I I I I I . . . C C C a a a r r r b b b o o o h h h y y y d d d r r r a a a t t t e e e s s s The four major biomolecules are: (i) carbohydrates; (ii) lipids; (iii) nucleic acids and (iv) proteins. F F F u u u n n n c c c t t t i i i o o o n n n a a a l l l s s s i i i g g g n n n i i i f f f i i i c c c a a a n n n c c c e e e Carbohydrates are both the energetic fuel (metabolic role) of the cell and the brick-and- mortar (structural role) of the cell parts. S S S t t t r r r u u u c c c t t t u u u r r r e e e Carbohydrates display two levels of structural organization: monosaccharides are polymers of (CH2O)n; n O CH ) ( 2 polysaccharide are chains of monosaccharides i.e. they are polymer of polymers. M M M o o o n n n o o o s s s a a a c c c c c c h h h a a a r r r i i i d d d e e e s s s The number of CH2O units can vary. Sugar no. of CH2O Exampl es Triose 3 Glycer ol tetrose 4 pentos e 5 Ribose hexose 6 Glucos e Most common monosaccharides are pentoses (ribose) and hexoses (glucose) but glycerol (triose) is also very important. K K K e e e t t t o o o s s s e e e s s s a a a n n n d d d a a a l l l d d d o o o s s s e e e s s s Hexoses are alcohols with additional aldehyde or keto group.
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