Biomolecules

Question 1

primary structure

Answer 1

sequence of amino acids

Question 2

secondary structure

Answer 2

a-helix or b-sheet

Question 3

tertiary structure

Answer 3

overall 3D structure of a molecule

Question 4

quaternary structure

Answer 4

large molecules formed via aggregation

Question 5

Corey-Pauling rules

Answer 5

1. 4 atoms in peptide link lie in relatively rigid plane - due to partial C=N in resonance structure
2. N, H and O atoms of H-bond lie in straight line with displacement of +-30 degrees allowed
3. all NH and CO groups are engaged in H-bonding

Question 6

types of B-sheets

Answer 6

antiparallel with N-H…O atoms og H-bonds in straight line
parallel with N-H…O atoms of H-bonds not as straight

Question 7

double helix

Answer 7

2 polynucleotide chains linked by H-bonds