Glucose and Marks

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Biological Molecules Revision Questions

1.Maltose and sucrose are disaccharide sugars in which a bond joins two monosaccharide molecules. Sucrose is formed by the formation of a bond between carbon 1 of a glucose molecule and carbon 2 of a fructose molecule. (i)Name the bond that joins the two molecules to form a disaccharide. ......................................................................................................................... [1]

(ii)Complete the diagram below to show what happens when the glucose and fructose molecules join together.

[2]
[Total 3 marks]

2.Glucose:
is a carbohydrate
is a hexose (six-carbon sugar)
has the formula C6H12O6
has a six-membered ring structure.
The diagram below shows the molecular structures of two monosaccharide sugars, glucose and fructose.

State one way, visible in the diagram above, in which the structure of fructose is:
similar to glucose;
.................................................................................................................................. ..................................................................................................................................

different from glucose.
.................................................................................................................................. ..................................................................................................................................

[Total 2 marks]

3.Complete the table below, comparing gum arabic with some other polysaccharides. |gum arabic|amylase|cellulose|glycogen|
branched structure|yes||no||
heteropolysaccharide|yes||no||
found inanimals/plants|plants||plants||
function in organism|healing cuts|||energy store|
[Total 4 marks]

4.Complete the following passage by inserting the most appropriate terms in the spaces provided.
Cellulose and collagen are both fibrous molecules. Cellulose, a carbohydrate, is the
main component of the ……………… ……………… in plants.
Cellulose is made of chains of many …… glucose molecules which are joined by 1,4
………………………… bonds. Each glucose molecule is rotated ……………° relative
to its neighbour, resulting in a ………………………… chain. Adjacent chains are held
to one another by ………………………… bonds.
[Total 6 marks]

5.Some species of Acacia tree produce gum arabic. Gum arabic is classed as a heteropolysaccharide. This means that it is made up of a number of different sugars.
Hydrolysis of gum arabic releases four different monosaccharides.
Describe what happens during the hydrolysis of a polysaccharide molecule. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. [Total 2 marks]

6.A sucrose molecule is a carbohydrate molecule made by joining a glucose unit to a fructose unit. (i)Name the bond that joins the units in a molecule of sucrose. ......................................................................................................................... [1]

(ii)Name the type of reaction that breaks this bond.
......................................................................................................................... [1]
[Total 2 marks]

7.The diagram below is an...
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