They are compact, water soluble, and usually spherical in shape.
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2. How do they form?
When proteins fold into their tertiary structures in such a way that the hydrophobic R-groups on the amino acids are kept away from the aqueous environment.
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3. Give an example of a globular protein.
Insulin. Which is involved in the blood glucose concentration regulation
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4. Why does insulin need to be globular?
It is a hormone and is transported in the bloodstream so needs to be soluble.
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5.What are conjugated proteins?
They are globular proteins that contain a non-protein component called a prosthetic group.
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6. What is the structure of haemoglobin?
It is a quaternary protein made of 4 polypeptides, 2 alpha and 2 beta subunits.
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7. What does each subunit contain?
A prosthetic haem group. The iron ions present in the haem combine reversibly with an oxygen molecule. This is what enables haemoglobin to transport oxygen around the body.
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8. What is a Catalase and what does it do?
A catalase is an enzyme. Enzymes catalyse reactions, meaning they increase reaction rates. Each enzyme is specific to a particular reaction.
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9. What is a Fibrous protein?
A fibrous protein is formed from long insoluble molecules. This is due to the presence of a high proportion of amino acids with hydrophobic R- groups in their primary structures.
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10. What is keratin?
Keratin is a group of fibrous proteins present in hair, skin, and nails. Many strong disulfide bonds are formed, forming strong, inflexible and insoluble materials. Hair has less of these bonds making it more flexible.
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11. What is Elastin?
Elastin is a fibrous protein found in elastic fibres. Elastic fibres are present in the walls of blood vessels and in the alveoli of the lungs. They make these structures more flexible but let them return to their original size.
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12. What is Collagen?
Collagen is a fibrous protein. It is a connective tissue found in skin, tendons, ligaments and the nervous system. They are made up of 3 polypeptides wound together in a long structure. It is also very flexible.
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Other cards in this set
Card 2
Front
2. How do they form?
Back
When proteins fold into their tertiary structures in such a way that the hydrophobic R-groups on the amino acids are kept away from the aqueous environment.
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