Biology 1.3 Proteins

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What difference do proteins have in organic elements to lipids and carbohydrates?
Proteins contain nitrogen as well as the other 3 elements.
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What else can also be present?
Sulphur and phosphorus
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What are proteins built up of?
From linear sequences of Amino acids (About 20 amino acids make up a protein)
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State the basic structure of an amino acid
-NH2 at one end of the amino acid and a -COOH group at the other as well as an R group
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How do separate amino acids link?
The amino group of one amino acid reacts with the carboxyl group of another with the elimination of water
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What bond is formed and what product is produced?
A peptide bond is formed and the resulting compound is a dipeptide
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What is a polypeptide?
A chain of many amino acids joined together
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What is the primary structure of a protein?
This is the sequence of amino acids in a polypeptide chain
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Describe secondary structure
Secondary structure is the shape that the polypeptide chain forms as a result of hydrogen bonding
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What does this secondary structure form?
Alpha helix (spiral) and Beta pleated sheet (wall)
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What is the tertiary structure?
When the secondary structure EG Alpha helix, can be folded and twisted to give a more complex, compact 3D structure
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How is this new tertiary shape maintained?
Its shape is maintained by disulphide, ionic and hydrogen bonds
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What is Quaternary structure?
A combination of 2 or more polypeptide chains in tertiary form
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Describe a fibrous proteins structure
A fibrous protein is made of 2 polypeptide bonds in parallel chains or sheets with numerous cross linkages to form fibres
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Describe a globular proteins structure
These proteins are compact and folded as spherical molecules
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State some properties of fibrous proteins
Insoluble in water, strong and tough
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State some functions of globular proteins
Enzymes, antibodies, plasma proteins and hormones
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1 fibrous protein consists of...
3 polypeptide strands tightly wound around one and other
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What is the name of the substance to test for proteins?
Biuret reagent
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Card 2

Front

What else can also be present?

Back

Sulphur and phosphorus

Card 3

Front

What are proteins built up of?

Back

Preview of the front of card 3

Card 4

Front

State the basic structure of an amino acid

Back

Preview of the front of card 4

Card 5

Front

How do separate amino acids link?

Back

Preview of the front of card 5
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