Self-assessment Test for PPS students.

Subject: "Protein Tertiary Structure I"

This self-assessment test is not for course evaluation purposes. Results and users of this form are not recorded anywhere, in any way!

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1) What type of structure is a beta-hairpin an example of:

2) What is a "mosaic protein" ?
A protein structure with high symmetry
A protein which contains more than one domain
A protein which gives a characteristic diffraction pattern
A protein which contains many repeated copies of one or more domains

3) What is the definition of protein quaternary structure?
The arrangement of protein chains within an active multi-chain protein
The arrangement of domains within a protein chain
The arrangement of motifs within a domain
The arrangement of helices and strands within a motif

4) Which of these statements, concerning the general principles of protein folding and packing, is false?
Hydrophilic amino acids are more often found on the surface of proteins than hydrophobic ones
Charged amino acids can be found in the interior of proteins if they are involved in hydrogen bonds or "salt bridges"
The native folded conformation of a protein is very much more stable than any other possible conformation
Unusual conformations in some proteins are stabilised by disulphide bond formation

5) When alpha helices pack together, which angles between the helices will allow the "ridges" of one helix to pack into the "grooves" of another to form a stable structure?

50 and 10 degrees
50 and 20 degrees
70 and 20 degrees
0 and 90 degrees

6) What is the most common form of the beta turn?