U1T1 – Monosaccharides & Disaccharides

Monosaccharides & Disaccharides

1 / 20

Which elements are found in carbohydrates?

Carbon and Hydrogen

Carbon, Hydrogen and Nirtogen

Carbon, Hydrogen and Oxygen

2 / 20

Which of the following is NOT a monosaccharide?

Lactose

Galactose

Glucose

3 / 20

What type of sugar is fructose?

Pentose

Hexose

Heptose

4 / 20

Which molecule is Beta - Glucose?

A

B

C

5 / 20

Which molecule is NOT glucose ?

A

B

C

6 / 20

Molecule D is NOT alpha glucose. What is wrong with it ?

The OH group is in the wrong place on carbon 1

The OH group is in the wrong place on carbon 2

The OH group is in the wrong place on carbon 4

7 / 20

Are molecules A,B and C isomers of each other?

Yes

No

8 / 20

Which of the following is a type of disaccharide?

galactose

fructose

sucrose

9 / 20

What type of reaction is used to join two monosaccharides?

Hydrolysis

Condensation

Phosphorylation

10 / 20

What type of bond forms between two monosaccharides?

Peptide

Hydrogen

Glycosidic

11 / 20

Which diagram shows a glycosidic bond - A or B ?

A

B

12 / 20

Does this diagram show a glycosidic bond?

Yes

No

13 / 20

Is one of the monomers beta glucose ?

Yes

No

14 / 20

Which disaccharide is made from glucose and galactose?

Sucrose

Maltose

Lactose

15 / 20

What are the products of a condensation reaction between two alpha glucose molecules?

Glucose and water

Maltose

Maltose and water

16 / 20

What would the products be from the hydrolysis of sucrose?

Glucose and Fructose

Glucose, Fructose and Water

Glucose, Galactose and water

17 / 20

Which reagent is used to test for reducing sugars?

Biurets

Benecol

Benedicts

18 / 20

Which is the correct method to test for reducing sugars?

Add an equal volume of reagent, and a positive result is a brick red.

Add an equal volume of reagent, heat in a boling water bath, and a positive result is a brick red precipitate.

Add an equal volume of hydrocholric acid, heat in a boiling water bath and observe a brick red precipitate.

19 / 20

Are all monosaccharides reducing sugars?

Yes

No

20 / 20

How do you convert sucrose (which will test negative for a reducing sugar) , into monosaccharides which will test positive as a reducing sugar?

Add sodium hydrogen carbonate to sucrose solution and heat.

Boil the sucrose solution first, then test for a reducing sugar.

Heat sucrose solution with HCl, then neutralise with sodium hydrogencarbonate. Then test for a reducing sugar.

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