JEE Main · 2020 · Shift-IImediumBIO-050

Two monomers in maltose are:

Biomolecules · Class 12 · JEE Main Previous Year Question

Question

Two monomers in maltose are:

Options
  1. a

    α-D-glucose\alpha\text{-D-glucose} and α-D-galactose\alpha\text{-D-galactose}

  2. b

    α-D-glucose\alpha\text{-D-glucose} and β-D-glucose\beta\text{-D-glucose}

  3. c

    α-D-glucose\alpha\text{-D-glucose} and α-D-glucose\alpha\text{-D-glucose}

    ✓
  4. d

    α-D-glucose\alpha\text{-D-glucose} and α-D-fructose\alpha\text{-D-fructose}

Correct Answerc

α-D-glucose\alpha\text{-D-glucose} and α-D-glucose\alpha\text{-D-glucose}

Detailed Solution

Step 1: Maltose Source — Maltose is a disaccharide obtained from the enzymatic hydrolysis of starch.

Step 2: Identifying Components — It consists of two units of the same monosaccharide linked by an α-1,4-glycosidic\alpha\text{-1,4-glycosidic} bond.

Step 3: Conclusion — Both monomer units are α-D-glucose\alpha\text{-D-glucose}, which is why it yields only glucose upon complete hydrolysis.

Key Point: Comparison: Lactose provides glucose + galactose, while sucrose provides glucose + fructose.

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