Which one of the following statements is wrong?
1. Glycine is a sulphur containing amino acid.
2. Sucrose is a disaccharide.
3. Cellulose is a polysaccharide.
4. Uracil is a pyrimidine.

The unique properties of each amino acid is determined by its particular:
1. R group
2. amino group
3. kinds of peptide bond
4. number of bonds to other amino acids

The R group in a proteinaceous amino acid is hydroxymethyl. This amino acid:
1. is not an essential amino acid
2. is not genetically coded for
3. is involved in disulfide linkage
4. is acidic in nature

Identify the incorrectly matched pair: