3.1.4 Proteins

Question 1

Amino acids are the monomers from which proteins are made

Answer 1

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Question 2

The general structure of an amino acid is

                R
                 I
H2N-----C------COOH
                 I
                H

Answer 2

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Question 3

N2H represents an amine group

Answer 3

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Question 4

COOH represents a carboxylic acid group

Answer 4

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Question 5

There are 20 amino acids that are common in all organisms , these amino acids differ only in their side group

Answer 5

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Question 6

A condensation reaction between two amino acids forms a peptide bond

Answer 6

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Question 7

Dipeptides are formed from the condensation of two amino acids

Poly peptides are formed from the condensation of many amino acids

Answer 7

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Question 8

A functional protein may contain one or more polypeptides

Answer 8

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Question 9

The biuret test is the test used to indicate the presence of proteins , biuret solution . Which is a mixture of sodium hydroxide and copper sulphate is added to a sample of the product being tested in solution form , a lilic colour change indicates a positive result

Answer 9

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