Skip to content
CIE Jun 2013 v1 Paper 4 Q6
Answers available below
Show answer
Question
1
2
3
4
5
6
7
8
![Examiners For Use 12 Section B Answer all the questions in the spaces provided. There are two important polymerisations that occur within living organismsprotein synthesis and the formation of DNA. (a) Complete the table placing a tick ( ) in the correct column to indicate in which process (cid:22) each substance could be used. protein synthesis formation of DNA substance adenine alanine aspartate phosphate [3] (b) Proteins and DNA form different helical structures. Brie y describe the bonding that maintains the shape of each of these helical structures. proteinDNA[4] (c) Describe the differences in bonding in the primary and tertiary structures of proteins. Your answer should include reference both to the nature of the bonding and the types of amino acid causing it.[3] [Total: 10]UCLES 2013 9701/41/M/J/13<br />](https://learnah.org/wp-content/uploads/2018/08/June_2013_v1_QP_-_Paper_4_CIE_Chemistry_A-level_6.jpg)
![Page 8 (a) Mark Scheme GCE A LEVELMay/June 2013 Syllabus 9701 Paper 41 substance protein synthesis formation of DNA adenine alanine aspartate phosphate (b) protein : hydrogen bonds between NH and C=O groups on different (peptide) groups DNA : hydrogen bonds between bases / A & T / C & G on different chains [3] [3] [1] [1] [1] [1] [4] [1] (c) primary: covalent bonds between (successive) amino acids tertiary : hydrogen bonds between COOH / OH and NH2 (in side chains) ionic bonds between NH3 + and CO2(in side chains) disulfide bonds between cysteine molecules / residues / SH groups (in side chains) van der Waals/VDW between alkyl groups / non-polar residues (in side forces chains) any two rowsCambridge International Examinations 2013 [2] [3] [Total: 10]<br />](https://learnah.org/wp-content/uploads/2018/08/June_2013_v1_MS_-_Paper_4_CIE_Chemistry_A-level_6.jpg)