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Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Consider the given statements.
I. Dextrin and glycogen are polysaccharides
II. Lactose and glucose are disaccharides
III.Sucrose and maltose are disaccharides
IV. Raffinose is oligosaccharide
The incorrect statements is/are:

  1. only II

  2. I and II

  3. I, II and III

  4. IV only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option (A) is right. The incorrect statement is (II).
(II) Lactose is a disaccharide while glucose is an aldosic monosaccharide.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Consider the given statements:


I. Maltose is also known as malt sugar.
II. Sucrose is also known as cane sugar.
III. Lactose is also known as grape sugar.
IV. Starch is also known as amylum.

The correct statement(s) is/are:

  1. I, II and IV

  2. I, II and III

  3. II, III and IV

  4. All
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(I) Maltose is also known as malt sugar.


(II) Sucrose is also known as cane sugar.

(III) Lactose is also known as milk sugar.

(IV) Starch is also known as amylum.

Hence, option A is correct.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Consider the statements about mono, di and oligo saccharides:


I. These are crystalline solids.
II. These are soluble in cold water.
III. These are tasteless.

The incorrect statement(s) is/are:

  1. only III

  2. I, II and III

  3. I and II only

  4. I and III only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monosaccharides, disaccharides and oligo saccharides are crystalline solids, water soluble and sweet in taste. They are called sugar.
Thus only statement III is incorrect.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

A carbohydrate which cannot be hydrolysed to simpler compounds is called:

  1. monosaccharide

  2. disaccharide

  3. polysaccharide

  4. oligosaccharide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monosaccharide cannot be hydrolyzed to simpler compounds as it is itself the simplest unit.
Disaccharides, polysaccharides and oligosaccharides can be hydrolyzed to monosaccharides.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

The minimum number of carbon atoms that should be present in a monosaccharide is :

  1. 2

  2. 3

  3. 4

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Monosaccharide is single polyhydroxy aldehyde (aldose) or ketone (ketose) units. Glucose is a single polyhydroxy aldehyde, while fructose is a single polyhydroxy ketone. A monosaccharide contains a skeleton, of carbon atoms. The minimum number of carbon atoms is three and it can go up to seven.