Carbohydrates Flashcards

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1
Q

Formular for glucose

A

C(6)H(12)O(6)

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2
Q

What elements do carbohydrates consist of

A

carbon, hydrogen and oxygen

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3
Q

Name the three monosacchardies

A

glucose, galactose and fructose

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4
Q

Why are monosacchardies soluble in water

A

Large number of OH groups, hydroxyl (from the hydrogen bonds with water molecules)

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5
Q

What is meant by hydrophilic

A

Water loving (so can dissolve in water)

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6
Q

What is a monosaccharide called when it contains 6 carbon atoms

A

hexose sugar

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7
Q

What is a monosacchardie called when it contains 5 carbon atoms

A

Pentose sugar

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8
Q

Example of a pentose sugar

A

Ribose

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9
Q

Draw an alpha + beta glucose

A

alpha h>h oh>oh and beta h>oh oh>h

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10
Q

How are disaccharides formed

A

2 sugar molecules (monosaccharides) joined up by a glycosidic bond

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11
Q

What kind of reaction is a monosaccharide to a disccharide

A

condensation

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12
Q

What is meant by condensation

A

A molecule of water is removed

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13
Q

What bond is between a disaccharide

A

Glycosidic bond

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14
Q

How do you break a glycosidic bond

A

Adding water (hydrolysis)

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15
Q

What is a hydrolysis reaction

A

Addition of water

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16
Q

What kind of reaction is a disaccharide to a monosaccharie

A

Hydrolysis

17
Q

Name 3 disaccardies and their formation

A

Maltose = glucose + glucose
Sucrose = glucose + fructose
Lactose= glucose + galactose

18
Q

Definition of a reducing sugar

A

Can donate an electron to another molecule

19
Q

Examples of reducing sugars (3)

A

all monosacchardies ,maltose and lactose

20
Q

Example of non-reducing sugars (1)

A

Sucrose

21
Q

What alkaline solution do you use to test for reducing sugars

A

Benedicts solution

22
Q

Findings from the reducing sugar practical

A

If it stays blue then no reducing sugar present
However if a reducing sugar is present the solution will go a brick-red colour
Blue-Green-Yellow-Orange-Brick Red

23
Q

When testing for non-reducing sugars what acid do you add

A

Dilute hydrochloric acid

24
Q

What is a polysaccharies

A

Multiple monosccharies joined together

25
Q

How is glucose produced

A

In plant cells, using light energy trapped during photosynthesis