M6S5 – Amino Acids

Which of these molecules does NOT consist of one or more chains of amino acids?

(i) The hormone insulin

(ii) The filaments in muscle fibres

(iii) The enzyme in saliva, amylase

(iv) The genetic material, DNA

If an amino acid is written as RCHNH₂CO₂H, in which of these amino acids is R a polar group?

(i) HSCH₂CHNH₂CO₂H

(ii) C₆H₅CH₂CHNH₂CO₂H

(iii) HOCH₂CHNH₂CO₂H

(iv) CH₃CHNH₂CO₂H

Which of these amino acids are chiral?

(i) CH₃CHNH₂CO₂H

(ii) C₆H₅CH₂CHNH₂CO₂H

(iii) HOCH₂CHNH₂CO₂H

(iv) CH₂NH₂CO₂H

Which of these compounds are solids at room temperature?

(i) propane

(ii) propanoic acid

(iii) propylamine

(iv) 2-aminopropanoic acid

Which of these phrases describes the tertiary structure of a protein?

The main forces which hold a coiled protein chain into an alpha-helix are:

Breaking down a polypeptide into amino acids by heating with dilute hydrochloric acid is an example of:

In a peptide made up of a sequence of four amino acids the number of peptide bonds is:

Glycine reacts with dilute hydrochloric acid to form:

Which of these formulae represent glycine in aqueous solution at pH 9?