Entrance Exams Question:

which aminoacid have a least ramachandran plot value?

proline

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In a rectangle the length is increased by of the original length . By what proportion should the width be reduced so that the area will be the same?	There is a bucket with lots of marbles. Some are red, some are blue, some are green and some are orange. We dont know the quantity of any. With your closed eyes how many minimum number of marbles you will pick so as to 100% sure that atleast 2 marbles have the same colors?