15(a)(i) 1 primary structure ; Q1(a)(i)-GCE-Biology -June 2013-F212/01 ACCEPT 1o structure IGNORE polypeptide NH2 at one end 15(a)(ii) 3 ; Q1(a)(ii)-GCE-Biology -June 2013-F212/01 If R group not shown as then award max 2 (as general COOH at opposite end ; ‘R’ structure asked for in Q) IGNORE labels C in centre (of a single amino acid) bonded ACCEPT displayed structure of NH2 / HNH (separately) to one R and one H ; ACCEPT displayed structure of COOH if correct double Foundations in Biology; bond shown L,M Biological molecules AWARD only if the candidate has drawn a single ‘amino acid’ Molecule H H2N C COOH R
15(a)(i) 1 primary structure ; Q1(a)(i)-GCE-Biology -June 2013-F212/01 ACCEPT 1o structure IGNORE polypeptide Foundations in Biology; Biological molecules L,M 15(a)(ii) 3 NH2 at one end ; COOH at opposite end ; C in centre (of a single amino acid) bonded (separately) to one R and one H ; Q1(a)(ii)-GCE-Biology -June 2013-F212/01 If R group not shown as ‘R’ then award max 2 (as general structure asked for in Q) IGNORE labels ACCEPT displayed structure of NH2 / HNH ACCEPT displayed structure of COOH if correct double bond shown AWARD only if the candidate has drawn a single ‘amino acid’ Molecule H H2N C COOH R