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प्रश्न
Which monosaccharide units are present in starch, cellulose and glucose and which linkages link these units?
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उत्तर
In starch a-glucose units are present, in cellulose β-D glucose units are present. In starch and glycogen glycosidic a-linkage is present and in cellulose glycosidic β-linkage is present between glucose units.
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संबंधित प्रश्न
What are the expected products of hydrolysis of lactose?
Write two main functions of carbohydrates in plants.
What are reducing sugars?
The number of primary and secondary hydroxyl groups in ribose are -
(a) 1, 3
(b) 2, 3
(c) 3, 1
(d) 3, 2
The following molecule is called as:
\[\begin{array}{cc}
\ce{CHO}\phantom{..}\\
|\phantom{......}\\
\ce{(CHOH)4}\\
|\phantom{......}\\
\ce{CH2OH}
\end{array}\]
Glycosidic linkage is found between ____________.
Glucose gives silver mirror test with Tollen’s reagent. It shows the presence of ____________.
Monosaccharides usually contains ____________ carbon atoms.
Reducing sugars reduce ____________.
Glucose can’t be classified as ____________.
Which of the following reagent cannot distinguish between glucose and fructose?
Three cyclic structures of monosaccharides are given below which of these are anomers.
| (I) |  |
| (II) |  |
| (III) |  |
Structure of a disaccharide formed by glucose and fructose is given below. Identify anomeric carbon atoms in monosaccharide units.
Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?
What are glycosidic linkages? In which type of biomolecules are they present?
Assertion: Deoxyribose, \[\ce{C5H10O4}\] is not a carbohydrate.
Reason: Carbohydrates are hydrates of carbon so compounds which follow \[\ce{C_x(H2O)_y}\] formula are carbohydrates.
The following questions are case-based questions. Read the passage carefully and answer the questions that follow:
| Carbohydrates are optically active polyhydroxy aldehydes and ketones. They are also called saccharides. All those carbohydrates which reduce Fehling's solution and Tollen's reagent are referred to as reducing sugars. Glucose, the most important source of energy for mammals, is obtained by the hydrolysis of starch. Vitamins are accessory food factors required in the diet. Proteins are the polymers of α-amino acids and perform various structural and dynamic functions in the organisms. Deficiency of vitamins leads to many diseases. |
Answer the following:
(a) The penta-acetate of glucose does not react with Hydroxylamine. What does it indicate? (1)
(b) Why cannot vitamin C be stored in our body? (1)
(c) Define the following as related to proteins: (2)
- Peptide linkage
- Denaturation
OR
(c) Define the following as related to carbohydrates: (2)
- Anomers
- Glycosidic linkage
