Question

Hydrolysis of which disaccharide in presence of enzyme maltase gives glucose only?

• A. Sucrose
• B. Cellulose
• C. Lactose
• D. Maltose

Hint:

Remember the hydrolysis products: \[ \text{Maltose} \rightarrow \text{Glucose + Glucose} \] \[ \text{Sucrose} \rightarrow \text{Glucose + Fructose} \] \[ \text{Lactose} \rightarrow \text{Glucose + Galactose} \] Maltose is the only common disaccharide that yields only glucose molecules.

Answer 1

The Correct Option is D

Step 1: Recall the action of maltase.
Maltase is a specific enzyme that catalyzes the hydrolysis of maltose.
The reaction is \[ \text{Maltose} + H_2O \xrightarrow{\text{Maltase}} \text{Glucose} + \text{Glucose} \] Thus, maltose produces only glucose molecules on hydrolysis.

Step 2: Analyze the other options.

Sucrose:
Sucrose is hydrolysed by invertase (sucrase) to give \[ \text{Glucose} + \text{Fructose} \] Hence, it does not produce only glucose.

Cellulose:
Cellulose is a polysaccharide, not a disaccharide. It is hydrolysed by cellulase and therefore is not the correct answer.

Lactose:
Lactose is hydrolysed by lactase to give \[ \text{Glucose} + \text{Galactose} \] Hence, it also does not produce only glucose.

Step 3: Identify the correct disaccharide.
Among the given options, only maltose undergoes hydrolysis to form two molecules of glucose. \[ \text{Maltose} \xrightarrow{\text{Maltase}} 2\text{Glucose} \]

Step 4: Final conclusion.
Therefore, the disaccharide whose hydrolysis in the presence of maltase gives only glucose is \[ \boxed{\text{Maltose}} \] Hence, the correct option is \[ \boxed{(4)} \]