Biomolecules in the Cell > Carbohydrates - Disaccharides

Estimated time: 2 minutes

Maharashtra State Board: Class 12

Key Points: Disaccharides

Sucrose consists of one unit each of α-D-glucopyranose and β-D-fructofuranose.
It contains an α, β-1,2-glycosidic linkage.
Maltose is composed of two α-D-glucopyranose units joined by an α-1,4-glycosidic bond.
Lactose consists of β-D-galactopyranose and β-D-glucopyranose units.
It has a β-1,4-glycosidic linkage.

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Biomolecules part 8 (Glucose Anomers) [00:13:43]

Which of the following has not a glucosidic linkage?

What happens when D-glucose is treated with the following reagent?

HNO₃

Hydrolysis of sucrose is called ______.

Match the following enzyms given in Column I with the reactions they catalyse given in Column II.

Column I (Enzymes)	Column II (Reactions)
(i) Invertase	(a) Decomposition of urea into NH₃ and CO₂
(ii) Maltase	(b) Conversion of glucose into ethyl alcohol
(iii) Pepsin	(c) Hydrolysis of maltose into glucose
(iv) Urease	(d) Hydrolysis of cane sugar
(v) Zymase	(e) Hydrolysis of proteins into peptides

What do you understand by the term glycosidic linkage?

Which of the following will not show mutarotation?

Answer the following question.
Write the products obtained after the hydrolysis of lactose.

When sucrose is hydrolysed the optical rotation values are measured using a polarimeter and are given in the following table:

Account for the two specific rotation values.
What is the specific name given to sucrose based on the above observation?
One of the products formed during the hydrolysis of sucrose is a glucose, that reacts with hydroxylamine to give compound A. Identify compound A.