Which amino acid from following contains $-\mathrm{CH}_3$ as side chain?

Which carbon atoms of $\alpha-D$ glucose and $\beta-D$ fructose respectively forms glycosidic linkage in sucrose?

Which from following nitrogen bases either of purine or pyrimidine does NOT contain $-\mathrm{NH}_2$ group attached with its ring?

Which from following amino acids contains heterocyclic ring at a side chain (R) group?