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EK Lecture 3 Q 69
Junaid_2813
#1 Posted : Monday, June 29, 2020 10:26:35 PM
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Hi there,

While doing the Ek Lecture 3 chapter questions I was confused by the answer for Q 69. EK says that there are only 2 residues in the polypeptide but I was able to ID 3: F, I, and G. Is EK wrong here?

Thank you :)
Junaid


INSTR_Katerina_102
#2 Posted : Thursday, July 02, 2020 2:00:09 PM
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Hey,

These can be tricky because you can only use the information given and not extrapolate outwards (even though they don't complete carbon's 4 bonds and imply it is attached to another thing)

Note that the question is asking for complete residues, of which F and I are completely there.

However they are trying to trick you with G. For you to get out a complete amino acid residue, you need it to have an NH2 and a COOH group.

Here it is not shown that G has an attached C=O, only a NH.

Because of this, we can only count F and I as they have NH and C=O termini.

Which is sad because it no longer spells FIG )':

Please let me know if this is unclear!

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