Biology unit 1, topic 2 - proteins

Describe the structure of an amino acid
an amino group, an R group (variable group - 20 different types), carboxyl group, a hydrogen and a central carbon
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How do you form a protein?
a condensation reaction between the amino group of 1 amino acid and the carboxly group of another, bonding them together with peptide bonds
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What is meant by primary structure?
the sequence of amino acids (held together with peptide bonds)
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What is meant by the secondary structure?
the folding and shaping of the line of amino acids, (formation of hydrogen bonds, B pleated sheets and A-helix's)
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What is meant by the tertiary structure?
the 3D shape of the chain of amino acids (using ionic bonds, disulphide bridges, hydrophilic and hydrophobic tendencies)
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What is meant by the quaternary structure?
when other proteins and molecules join together (3D arrangement of more than one tertiary polypeptide)
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Describe the properties of a fibrous protein
has little/no tertiary structure - long, parallel polypeptide chains with occasion cross-linkages to form fibers (tough - tightly coiled with strong bonds), insoluble in water, found in connective tissue, tendons, bones and muscles
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Describe the properties of a globular protein
have complex tertiary structures, and often quaternary structures, folded into spherical shapes, soluble (easily transported in fluids), form enzymes and hormones
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Other cards in this set

Card 2

Front

How do you form a protein?

Back

a condensation reaction between the amino group of 1 amino acid and the carboxly group of another, bonding them together with peptide bonds

Card 3

Front

What is meant by primary structure?

Back

Preview of the front of card 3

Card 4

Front

What is meant by the secondary structure?

Back

Preview of the front of card 4

Card 5

Front

What is meant by the tertiary structure?

Back

Preview of the front of card 5
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