FFLD 5

Question 1

Match each description with the different levels of protein structure
A. Primary amino acid sequence
B. Secondary protein structure
C. Tertiary protein strutcure
D. Quaternary protein structure
1. Long chain of amino acids joined together by peptide bonds, i.e. a polypeptide
2. Long chain amino a cid sequence that has been folded up into alpha helices and beta sheets
3. A polypeptide that has been folded up completely into its final 3D structure and consists of its complete collection of secondary protein structures
D. Two or more tertiary structure interacting with weak/non-covalent bonds and carry out a function as a team

Answer 1

A - 1
B - 2
C - 3
D - 4

Question 2

With regards to protein structure, phi and psi:
A. Are Greek letters
B. Are different functional groups in the protein
C. Describe different angles in the protein
D. Are different types of protein bonds

Answer 2

C

Question 3

Which two amino acids are good to have in beta turns but detrimental for the formation of alpha helices?
A. Alanine
B. Glycine
C. Proline
D. Serine

Answer 3

B and C

Question 4

Beta sheets (select all the correct answers)
A. Are made up of two or more (up to 10) strands
B. Are made up of 2-10 individual polypeptides
C. Can be parallel or anti-parallel
D. Have its strands held together by disulphide bonds
E. Often have a polar and non-polar side
F. Are “flat” (planar) and straight (no turning/twisting)
G. Have all its amino acid side chains pointing out on one side on the sheet

Answer 4

A, C and E