Disaccharides

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9 Terms

1
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How are disaccharides formed?

  • To make monosaccharides more suitable for transport, storage & to have less influence on a cell’s osmolarity, they are bonded together to form disaccharides & polysaccharides

  • Disaccharides & polysaccharides are formed when two hydroxyl (-OH) groups interact to create a strong covalent bond called the glycosidic bond


2
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How are glycosidic bonds formed?

  • Condensation reaction

  • Glycosidic bond formed between two glucose molecules is called a 1:4 glycosidic bond because a glucose bonds between a carbon 1 & carbon 4


3
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Give formula for disaccharides


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4
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How is sucrose formed?

Condensation reaction between a-glucose & fructose

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How is maltose formed?

Condensation reaction between a-glucose & a-glucose

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How is lactose formed?

Condensation reaction between a-glucose & galactose

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State the function of sucrose

Main sugar in plants produced & transported by phloem

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State the function of maltose

Sugar formed in production & breakdown of starch

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State the function of lactose

Sugar found only in milk