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Karnataka Board PUCPUC Science 2nd PUC Class 12

Biomolecules in the Cell > Carbohydrates

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Estimated time: 6 minutes
Maharashtra State Board: Class 12

Definition: Sugars

Carbohydrates that are crystalline solids, sweet in taste and soluble in water are called sugars.

Maharashtra State Board: Class 12

Definition: Non-Sugars

Carbohydrates that are amorphous solids, tasteless and insoluble in water are catled non-sugars.

Maharashtra State Board: Class 12

Definition: Reducing Sugars

The sugars that reduce the Tollen's reagent and Fehling's solution are called reducing sugars.

Maharashtra State Board: Class 12

Key Points: Biomolecules in the Cell > Carbohydrates

  • Carbohydrates are organic biomolecules made of C, H and O, usually fitting the general formula Cx(H₂O)y and existing as aldoses or ketoses.
  • They are classified into monosaccharides, disaccharides and polysaccharides; monosaccharides cannot be hydrolysed further, disaccharides are formed by two monosaccharides via glycosidic bonds, and polysaccharides are long polymers.
  • Some sugars like digitoxose (C₆H₁₂O₄) and rhamnose (C₆H₁₂O₅) do not obey the typical Cx(H₂O)y formula.
  • All monosaccharides are reducing sugars because they possess a free aldehyde or ketone group.
  • Cellulose is a linear polymer of β‑D‑glucose, unlike starch and glycogen, which are polymers of α‑glucose and show branching.
  • Biologically, carbohydrates supply energy for metabolism; glucose is the main substrate for ATP synthesis, and lactose provides energy to infants.
  • Polysaccharides such as starch and glycogen act as storage products and also contribute to structural components of cell membranes and cell walls.

Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

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Series 3


Shaalaa.com | Biomolecules Plants part 4 (Carbohydrates)

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Biomolecules Plants part 4 (Carbohydrates) [00:10:47]
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