Which of the following amino acids is most likely to be found at the lipid-water interface of a membrane bound alpha-helix? Cys Met Thr Tyr Lys

The sequence of amino acids within a polypeptide chain represents the key factor in which level(s) of protein structure?

What would be the net charge on the amino acid cysteine at pH 7.4?  

SOURCE C

SOURCE D

Which of the following amino acids has a nucleophilic side chain?

SOURCE G There exist inside the League two ideas about how best to preserve peace. There is the idea that when a state announces a foreign policy based on aggression and invading other countries’ frontiers, the League has the duty of declaring that it will fight such a policy with every means at its disposal. There  is,  however,  another  idea  that  the  aggressor  should  be  treated  with  consideration  and  that  negotiations should be carried out with the assurance that no collective action will be carried out.  Unfortunately, this is the policy that has so far been followed and it has as its consequences three wars and threatens to bring us a fourth. Maxim Litvinov speaking at the League of Nations Assembly, September 1938. Litvinov was in charge of Soviet foreign policy.

COP I vesicles are involved in:  

In the manufacture of a drug substance by cooling crystallisation at 250°C there are 260 g L-1 solute in solution. The saturated solubility of the solute at 60°C is 20 g L-1. What is the amount of the solute that can be crystallised in 1 L by cooling down to 60°C?  

Now answer all the following questions. You may use any of the sources to help you answer the questions, in addition to those sources which you are told to use. In answering the questions you should use your knowledge of the topic to help you interpret and evaluate the sources. 1 Study Sources A and B. How far do these two sources agree? Explain your answer using details of the sources. {7}   2 Study Sources C and D. How similar are these two cartoons? Explain your answer using details of the sources and your knowledge. {8}   3 Study Source E. What is the cartoonist’s message?  Explain your answer  using  details  of  the  source  and  your knowledge. {8}   4 Study Source F. Are you surprised by  this  source?  Explain  your  answer  using  details  of  the  source  and  your  knowledge. {8}   5 Study Sources G and H. How far does Source G prove that Source H is wrong? Explain your answer using details of the sources and your knowledge {7}   6 Study all the sources. How far do these sources provide convincing evidence that the League of Nations was a failure?  Use the sources to explain your answer. {12}