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Biology - Biological Molecules > Fibrous Proteins > Flashcards

Fibrous Proteins Flashcards

1
Q

What 2 things can result in the formation of fibrous proteins?

A

3D tertiary and quaternary structure of proteins

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2
Q

What similar properties do fibrous proteins have?

3

A

Long polypeptide chains with repeating sequences of amino acids

Insoluble in water

The polypeptide chains are able to form fibres which make the proteins stronger

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3
Q

Why are fibrous proteins insoluble in water?

A

The amino acids have non-polar R groups

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4
Q

What are 3 examples of fibrous proteins?

A

Collagen

Keratin

Elastin

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5
Q

What is the function of collagen?

A

Forms tendons

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6
Q

What is the function of keratin?

A

Hardens fingernails

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7
Q

What is the function of elastin?

A

Makes tissue stretchy

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8
Q

What is the definition of a fibrous protein?

A

A very long, strong and insoluble protein which often has a structural role in organisms

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9
Q

Collagen

What does collagen form?

A

Very strong fibres

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10
Q

Collagen

What is collagen used to provide?

A

Strength to many parts of the body

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11
Q

Collagen

Where is collagen found?

Why?

A

In artery walls

To prevent vessels from bursting from high pressure

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12
Q

Collagen

What is collagen used to make?

(2)

A

Tendons

Bone

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13
Q

Collagen

What do tendons do?

What does it allow?

A

Connect muscles to bone

Allowing the skeleton to move

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14
Q

Keratin

What are 2 properties of keratin?

A

Hard

Strong

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15
Q

Keratin

Where in the body is keratin found?

(3)

A

Fingernails

Horns

Hooves

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16
Q

Keratin

What does the primary structure of keratin contain?

A

High amounts of cysteine

17
Q

Keratin

What is cysteine?

A

An amino acid containing sulphur

18
Q

Keratin

What does the primary structure of keratin result in?

A

Disulphide links forming between the 2 polypeptide chains which makes the molecule very hard and strong

19
Q

Elastin

What properties does elastin have?

(2)

A

Elastic properties:

They can stretch

And recoil

20
Q

Elastin

Why is elastin stretchy?

(2)

A

Due to cooling of the elastin molecule

And crosslinks that keep the molecules together

21
Q

Elastin

Where is elastin found?

(3)

A

In the:

Lungs
Bladder
Blood vessel walls

22
Q

Elastin

Why is elastin found in the lungs?

A

To help them inflate and deflate during ventilation

23
Q

Elastin

Why is elastin found in the bladder?

A

To help it expand when holding urine

24
Q

Elastin

Why is elastin found in the blood vessels walls?

A

Because it helps maintain blood pressure by stretching and recoiling

Biology - Biological Molecules (18 decks)

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