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

Carbohydrates that, on attempted hydrolysis, are not cleaved to smaller carbohydrates are called :

  1. oligosaccharides

  2. polysaccharides

  3. disaccharides

  4. monosaccharides
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone is called a monosaccharide. Some common examples are glucose, fructose, ribose, etc.
Carbohydrates that yield two to ten monosaccharide units, on hydrolysis, are called oligosaccharides. They are further classified as disaccharides, trisaccharides, tetrasaccharides, etc., depending upon the number of monosaccharides, they provide on hydrolysis. Amongst these the most common are disaccharides. The two monosaccharide units obtained on hydrolysis of a disaccharide may be same or different.

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

Carbohydrates mix directly with blood and supply energy to the cells.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
As we take carbohydrates, our body breaks them simple sugars (glucose, fructose, and galactose) which are absorbed into the bloodstream. Any glucose not needed right away gets stored in the muscles and liver in the form of glycogen.
Therefore, the given statement is wrong
Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

From the following substances, which carbohydrates has the maximum sweetness?

  1. Sucrolose

  2. Saccharin

  3. Aspartme

  4. Alitame
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All sugars are compared relative to sucrose on the basis of sweetness. Hence, sucrose is rated one in terms of sweetness. 

Alitame is the sweetest among the following with a sweetness rating of 2000, while saccharin, aspartame, and sucralose have a rating of 400, 180, and 600 respectively

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

Carbohydrates are ___________.

  1. used to make a paper

  2. produced as an intermediate in the synthesis of proteins

  3. the polyhydroxy aldehyde or polyhydroxy ketone

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbohydrates are polyhydroxy aldehydes or polyhydroxy ketone. Cellulose is a carbohydrate used to make a paper. Carbohydrates are also produced as an intermediate in the synthesis of protein.

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

The polyhydroxy aldehydes are called:

  1. proteins

  2. fats

  3. carbohydrates

  4. vitamins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Polyhydroxy aldehydes or ketones are molecules with more than one hydroxyl group $(−OH)$, and a carbonyl group $(C=O)$ either at the terminal carbon atom (aldose) or at the second carbon atom (ketose) are called carbohydrates.
  • Monosaccharides are polyhydroxy aldehydes and are called Simple Sugar, any of the basic compounds that serve as the building blocks of carbohydrates.