AQA A-Level Biology - Proteins revision papers with correct questions and answers.docxAQA A-Level Biology - Proteins revision papers with correct questions and answers.docx

AQA A-LEVEL BIOLOGY - PROTEINS
REVISION PAPERS WITH CORRECT
QUESTIONS AND ANSWERS

Amino Acid (Correct Answers) A monomer that will join with other amino acids to form a
protein


Dipeptide (Correct Answers) Two amino acids bonded together via a peptide bond

Polypeptide (Correct Answers) Many amino acids bonded together via peptide bonds

Protein (Correct Answers) A combination of polypeptides

Amine Group (Correct Answers) -NH2, a basic group where the amino part of amino
acid comes from

Carboxyl Group (Correct Answers) -COOH, an acidic group where the acid part of
amino acid comes from

R Group (Correct Answers) A side group that can be comprised of different chemical
groups

Condensation Reaction (Correct Answers) The reaction that allows the formation of a
peptide bond

Process of a Condensation Reaction (Correct Answers) A H+ is removed from the
amine group, and the OH- is removed from the carboxyl group on the other amino acid.
This forms water and a dipeptide.

Primary Structure (Correct Answers) The linear amino acid sequence of the polypeptide
chain

Secondary Structure (Correct Answers) The arrangement of the primary structure when
considering hydrogen bonds. This forms either an alpha helix or a beta pleated sheet

Alpha Helix (Correct Answers) A helix shape that can be formed when considering a
polypeptide's secondary structure