Proteins Flashcards

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1
Q

Describe the biochemical test for lipids.

A

Add ethanol to test substance and shake, then pour into water. Positive result = milky emulsion.

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2
Q

Name the chemical bond that is formed between two amino acids during a condensation reaction

A

peptide bond

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3
Q

Describe the biochemical test for proteins, including a negative and positive test result.

A

Add sodium hydroxide solution to test sample, then add copper sulfate solution. Negative result = solution stays blue.
Positive result = turns purple.

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4
Q

Describe the primary structure of a protein.

A

Sequence of amino acids

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5
Q

Describe the secondary structure of a protein.

A

chain coils into an alpha helix or folds into a beta sheet - held in place by hydrogen bonds.

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6
Q

Name the three chemical bonds found in the tertiary structure of a protein.

A

Hydrogen bonds, ionic bonds and disulphide bridges

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7
Q

Describe the quaternary structure of a protein.

A

Two or more polypeptide chains held together by bonds.

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8
Q

Name two examples of proteins with quaternary structures.

A

Insulin, Haemoglobin, collagen, antibodies

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