Proteins - Retrieval Questions 3

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Give an example of a transport proteins.

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Haemoglobin

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Give an example of a hormone.

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Insulin

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20 Terms

1
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Give an example of a transport proteins.

Haemoglobin

2
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Give an example of a hormone.

Insulin

3
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Give an example of an enzyme.

Pepsin

4
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Define globular protein

It is a protein with a spherical shape that is soluble in water. They usually have metabolic roles.

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Where is haemoglobin found?

In red blood cells.

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What is the role of haemoglobin?

To transport oxygen from the lungs to the body tissues.

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What structure does haemoglobin have?

A quaternary structure.

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Why does haemoglobin have a quaternary structure?

Because it is made up of four polypeptide chains.
It has two alpha globin and two beta globin.

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Why is haemoglobin also described as a conjugated protein?

Because it has a prosthetic group attached to each polypeptide chain.

10
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What is a prosthetic group?

It is a non-protein component that is necessary for the protein to carry out its function.

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What are prosthetic groups in haemoglobin called?

They are called haem groups.

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What do the haem groups contain?

An iron ion.

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How many oxygens can haemoglobin tranport?

Haemoglobin can transport 4 oxygen molecules. this is because one oxygen molecule can bind to each haem group.

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What is insulin?

It is a globular protein that is secreted by the pancreas.

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What is the role of insulin?

The role of insulin is to maintain blood glucose concentrations.

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What is insulin composed of?

It is composed of two polypeptide chains. One chain is alpha helix, the other is beta pleated sheet.

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What are the two polypeptide chains in insulin joined together with?

Disulphide links.

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How is the shape of insulin relevant to its function?

The shape of insulin allows it to specifically bind to receptors on cell membranes to help lower blood glucose concentrations.

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Why is insulin soluble in water?

Because it has a hydrophilic r group on the outside.

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Why is it good that insulin is soluble?

So that it can dissolve in blood and be easily transported around the body.