Amino acids, Proteins & DNA (A Level only) (AQA A Level Chemistry)

The structure of the amino acid lysine is shown below:

The species present in a solution at low pH would be:

A dipeptide molecule is shown below:

When the dipeptide is hydrolysed the two molecules formed are

Which ways can amino acids in a protein chain bond together?

Which statement is not true about amino acids and DNA?

Which statement correctly describes the action of the anti-cancer drug cis-platin?

The structures of four ∝-amino acids are shown below. Due to different R-groups, ∝-amino acids can be acidic, basic or neutral.

Which is the correct set of descriptions for these ∝-amino acids?

The structure of the amino acid cysteine is shown below:

Cysteines are important ∝-amino acids present in the formation of insulin from two protein chains, containing ‘R’ side groups that can interact with each other.

If these interactions do not occur correctly, which of the following will not be affected?

A tripeptide was hydrolysed and analysed using thin-layer chromatography. A diagram of the TLC plate is shown below:

Using this information, which of the following amino acids were present in the tripeptide?

Drugs are developed from existing drugs to improve action or reduce side effects. Three anti-inflammatory drugs that act as COX-1 and COX-2 inhibitors are shown below:

Which of the following statements is not correct?

Adenine and thymine are two of the base pairs involved in the formation of DNA. The structures of these bases are shown on your data sheet.

Which statement is not correct about the hydrogen bonding between adenine and thymine?