1.3 Carbohydrates — disaccharides and polysaccharides Flashcards

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1
Q

What are disaccharides?

A

Disaccharide is a sugar that is formed by combining two monosaccharides.

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2
Q

How are disaccharides formed?

A

Condensation of two monosaccharides

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3
Q

What will be formed when condensation reaction happens between two monosaccharides?

A

A glycosidic bond

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4
Q

What are the examples of disaccharides?

A
  1. maltose
  2. sucrose
  3. lactose
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5
Q

How is maltose formed?

A

Condensation of two glucose molecules

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6
Q

How is sucrose formed?

A

Condensation of a glucose molecules and a fructose molecule

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7
Q

How is lactose formed?

A

Condensation of a glucose molecule and a galactose molecule

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8
Q

What are polysaccharides?

A

Polysaccharides are polymers that are formed by combining many monosaccharides.

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9
Q

How are polysaccharides formed?

A

Condensation of many monosaccharides/glucose units

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10
Q

What will be formed when condensation reaction happens between many monosaccharides?

A

Glycosidic bonds

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11
Q

What are the examples of polysaccharides?

A
  1. starch
  2. glycogen
  3. cellulose
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12
Q

Are polysaccharides soluble or insoluble? Why?

A

Insoluble, because they are very large molecules.

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13
Q

What is used to test for non-reducing sugars?

A

Hydrolyse the non-reducing sugar into its monosaccharide components by hydrolysis, then use Benedict’s solution.

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