3.7 Types Of Protiens

Question 1

What are the properties of globular proteins

Answer 1

Compact, water soluble, usually rough and spherical in shape

Question 2

When do globular proteins form

Answer 2

Form when proteins fold into their tertiary structures in a way that the hydrophobic r groups are kept away from the aqueous environment

Question 3

Why are globular proteins water soluble

Answer 3

Because the hydrophilic r groups are kept on the outside of the proteins

Question 4

Why is it important for globular proteins to be water soluble

Answer 4

They are vital for chemical reactions, immunity and muscle contractions

Question 5

What is an example of a globular protein

Answer 5

Insulin

Question 6

What are conjugated proteins

Answer 6

Globular proteins that contain a prosthetic group

Question 7

What is a prosthetic group

Answer 7

Non protein component of a conjugated protein

Question 8

What are examples of conjugated proteins

Answer 8

Lipids joining with proteins to become lipoproteins

Carbohydrates joining with proteins forming glycoproteins

Question 9

What is haemoglobin

Answer 9

The red oxygen carrying pigment found in the red blood cells

Question 10

What type of protein is haemoglobin

Answer 10

A quaternary protein made from four polypeptides

Question 11

What four polypeptides is haemoglobin made from

Answer 11

Two alpha and two beta subunits

Question 12

What are haem groups

Answer 12

Prosthetic groups that contain iron 2 so can transport oxygen

Question 13

What is catalase

Answer 13

An enzyme that speeds up the breakdown of hydrogen peroxide

Question 14

What type of protein is catalase

Answer 14

Quaternary

Question 15

What are fibrous proteins

Answer 15

Long, insoluble, structural proteins

Question 16

Why are fibrous proteins insoluble

Answer 16

Because of the large amount of hydrophobic r groups in their primary structures

Question 17

Why are fibrous proteins very organised structures

Answer 17

Because there is a very limited range of amino acids causing the sequence to be repetitive

Question 18

What are examples of fibrous proteins

Answer 18

Keratin
Elastin
Collagen

Question 19

What is keratin

Answer 19

A group of fibrous proteins present in hair, skin and nails

Question 20

What are the characteristics of keratin

Answer 20

Strong, inflexible and insoluble

Question 21

What determines the degree of flexibility of keratin

Answer 21

The degree of disulfide bonds

Question 22

What is elastin

Answer 22

A fibrous protein found in elastic fibres

Question 23

Where are elastic fibres containing elastin found

Answer 23

In the walls of blood vessels and in the alveoli of the lungs

Question 24

What is the main characteristic of elastin

Answer 24

It is stretchy and elastic

Question 25

What type of protein is elastin

Answer 25

Quaternary

Question 26

What is collagen

Answer 26

A fibrous protein which acts as a connective tissue in skin, tendons, ligaments and the nervous system

Question 27

What is the make up of collagen

Answer 27

Three polypeptides wound together in a long rope like structure

Question 28

What is the key property of collagen

Answer 28

Flexibility

Question 29

What is the difference between conjugated and simple proteins

Answer 29

Conjugated contain a prosthetic group whereas simple don’t