JEE Main · 2020 · Shift-IImediumBIO-050

Two monomers in maltose are:

Biomolecules · Class 12 · JEE Main Previous Year Question

Question

Options

a
$\alpha\text{-D-glucose}$ and $\alpha\text{-D-galactose}$
b
$\alpha\text{-D-glucose}$ and $\beta\text{-D-glucose}$
c
$\alpha\text{-D-glucose}$ and $\alpha\text{-D-glucose}$
✓
d
$\alpha\text{-D-glucose}$ and $\alpha\text{-D-fructose}$

Correct Answerc

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

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 $\alpha\text{-1,4-glycosidic}$ bond.

Step 3: Conclusion — Both monomer units are $\alpha\text{-D-glucose}$ , 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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