Tag: introduction to carbohydrates

Questions Related to introduction to carbohydrates

State whether the following statements are True or False:
Glucose is more sweeter than fructose

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. True

  2. False

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Correct Option: B
Explanation:

False-Fructose is more sweeter than glucose

To separate a mixture of monosaccharides, you would use :

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. Centrifuge

  2. Chromatograph

  3. Mass spectrometer

  4. Electrolytic cell

  5. Dialysis

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Correct Option: B
Explanation:

Two-dimensional ascending chromatography has been employed to separate a mixture of monosaccharides.

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

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. 2

  2. 3

  3. 4

  4. 6

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Correct Option: B
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.

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

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. oligosaccharides

  2. polysaccharides

  3. disaccharides

  4. monosaccharides

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Correct Option: D
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.

Choose the incorrect statement from following:

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. Monosaccharides are optically active polyhydroxy carbonyl compounds

  2. Fructose does not reduce Fehling's solution becauese it is a ketose

  3. $\alpha$-D(+)-Glucose and $\beta$-D(+)-glucose are anomers

  4. D-Glucose and D-mannose are C-2 epimers

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Correct Option: B

Glucose and fructose are both monosaccharides.

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. True

  2. False

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Correct Option: A
Explanation:

Glucose and fructose are both monosaccharides as they cannot be hydrolysed further to simple sugars.

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

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. True

  2. False

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Correct Option: B
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

Which enzyme converts glucose to ethanol?

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. Diesterase

  2. Invertase

  3. Zymase

  4. Both (2) and (3)

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Correct Option: C
Explanation:

$Glucose\rightarrow Ethanol$
Zymase enzymes can do above conversion.
(catalyzes fermentation of sugar into ethanol & $CO _2$).

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

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. Sucrolose

  2. Saccharin

  3. Aspartme

  4. Alitame

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Correct Option: D
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

Carbohydrates contains carbon, hydrogen, and oxygen molecules.

carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

  1. True

  2. False

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Correct Option: A
Explanation:

Carbohydrates are the biomolecules containing carbon, hydrogen, and oxygen respectively. They are also called hydrates of carbon.