Amino Acids A test on pages 48-49 of the OCR A A2 chemistry textbook 0.0 / 5 ? ChemistryPolymersA2/A-levelOCR Created by: Former MemberCreated on: 10-02-15 20:09 What is an amino acid? The building blocks for the biological molecules, peptides and proteins. 1 of 13 What is a peptide? A compound made of amino acids linked by peptide bonds. 2 of 13 How many different amino acids does the body have? 20 3 of 13 What are assembled into proteins? Amino acids 4 of 13 What groups do alpha amino acids (those in the body) need to have? A basic amine group and an acidic carboxyl group connected to the same carbon 5 of 13 What are amino acids soluble in? Acids and bases 6 of 13 What is the simplest amino acid? Glycine 7 of 13 The R group on an amino acid can contain... OH, SH, COOH, NH2 8 of 13 What is a zwitterion? A dipolar ionic form of an amino acid that is formed by the donation of a hydrogen ion from the carboxyl group to the amino group. 9 of 13 Does a zwitterion have a charge? No 10 of 13 What is the isoelectric point? The pH value at which the amino acid exists as a zwitterion. 11 of 13 At a pH more acidic than the isoelectric point... Behaves as a base and accepts a proton forming a positive ion. 12 of 13 At a pH more alkaline than the isoelectric point... Behaves as a acid and donates a proton forming a negative ion. 13 of 13
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