Carbohydrates (C) Flashcards

Polysaccharides

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1
Q

Features of polysaccharides

A

Do not taste sweet
Insoluble in water
Function as storage or structural molecules
Joined by glycosidic bonds

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2
Q

What molecules is starch made up of?

A

Alpha glucose molecules

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3
Q

Where is starch found?

A

It is found in plants

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4
Q

What type of branches are in starch?

A

Long, branched chains

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5
Q

What is the function of starch?

A

A storage molecule
An insoluble store for glucose

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6
Q

Why is starch ideally suited to its function as a storage compound?

A

The molecule’s helical shape allows it to compactly store a lot of glucose in a small space
The branched structure increases the surface area for rapid hydrolysis back to glucose
Its insolubility makes it osmotically inactive, preventing it from affecting water balance within the cell

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7
Q

How to do the iodine test?

A

Add 2-3 drops of iodine/potassium iodide solution
If starch is present a blue/black colour is produced
If no starch is present the iodine solution remains orange/yellow

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8
Q

What is the iodine test?

A

A test to detect if a sample has starch present

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9
Q

What molecules is glycogen made up of?

A

Alpha glucose

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10
Q

What type of branches are in glycogen?

A

Highly branched with many free ends

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11
Q

Where is glycogen found?

A

It is found in the cytoplasm of animal cells
Mainly in the liver and muscle tissues

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12
Q

What is the function of glycogen?

A

A storage molecule
An insoluble store for glucose

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13
Q

Why is glycogen ideally suited to its function as a storage compound?

A

Highly branched and having many free ends means it can undergo rapid hydrolysis to release glucose for respiration
It’s many free ends means that it can be compacted easily storing a large amount of glucose in a small space
Insoluble so does not affect water potential
Too large to diffuse out of the cell

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14
Q

What does the branches’ structure mean for glycogen?

A

Can be hydrolysed more rapidly to release glucose for respiration
Can be compacted easily

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15
Q

What molecules is cellulose made up of?

A

Beta glucose

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16
Q

Where is cellulose found?

A

Found in the cell wall of plants

17
Q

What is the function of cellulose?

A

Provides structural strength to the cell wall

18
Q

What is the structure of cellulose like?

A

There are long, straight chains
These chains are held together by hydrogen bonds to form a fibril
They are lined up parallel to each other

19
Q

If hydrogen bonds are weak how is the cellulose providing structural strength?

A

The large number of hydrogen bonds provide collective strength

20
Q

Between the hydroxyl groups what is formed?

A

Hydrogen bonds

21
Q

What is the significance of the microfibrils?

A

They group together to form macrofibrils

22
Q

What are the similarities between starch, glycogen and cellulose?

A

They all:
- contain glucose monomers
- are formed during a condensation reaction
- osmotically inactive / insoluble