Topography prediction

I can understand the information given about the protein and what each one of them means separately (somewhat), but I can't predict topography. Please advise.

beta bends or reverse turns

The amino acid sequence shown below represents a portion of a peptide bond obtained from a large protein: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 His - Ile -Thr - Arg - Phe - Phe - Pro - Cys - Met - Gly - Glu - Ala - Ile- Pro - His - 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Thr - Glu - Asp - Cys - Gln - Met - Ile - His - Cys - Pro - Arg - Lys - Gln - Pro - Tyr (a) Determine where the chain would be more likely to show beta bends or reverse turns (b) Discuss where one would fin cross-linked disulfide bonds in this sequence (c) would you consider this molecule t... click for more

enzymes/thermal properties

Explain why the same kind of enzyme from organisms with differant optimal temps for growth can have such differant thermal properties

Biological Membranes

I need a clear and detailed explaination on biological membrane characteristics such as Biochemical properties (eg. composition, alignment, special features, etc.), biological transport routes and mechanisms of transport, and the properties of integral and peripheral proteins.

Coenzymes seem autonomous in thier catalytic structure...

Although coenzymes seem autonomous in thier catalytic structure they have no catalytic powers when not bound to an enzyme-why? Also need reference that I can go to and read more on this.