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Amino Acids (ht Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Amino Acids (ht Only)' from the broader topic Organic Chemistry. The test is geared towards the AQA exam board style syllabus.
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Which amino acid is unique because it lacks a chiral a-carbon and therefore is not optically active?
Proline has a distinct structure among standard amino acids. What effect does proline commonly have on protein secondary structure?
Which pair of pKa values is most consistent with a neutral amino acid that has an a-carboxyl pKa ˜ 2.2 and an a-amino pKa ˜ 9.4?
Which description best fits the role of an amino acid side chain in determining protein function?
Peptide sequencing by mass spectrometry often uses enzymatic digestion (e.g., trypsin). What is the role of trypsin in protein analysis?
Which of the following changes would shift the equilibrium of an amino acid acid–base reaction (HA ? A- + H+) to the right (more dissociation)?
Which statement explains why peptide bonds absorb strongly in the infrared (IR) spectrum around 1650 cm-1 (amide I band)?
Which statement correctly explains why most amino acids (except glycine) are chiral?
Which technique can distinguish L- and D- enantiomers of amino acids by measuring the rotation of plane-polarised light?
At a pH below the isoelectric point (pI) of an amino acid, what is the predominant net charge on the molecule?
Which statement about side chains of acidic amino acids (aspartic and glutamic acid) is true at physiological pH (~7.4)?