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A level Biology: Post your doubts here!

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Thank you so much brother :D
Well i do have that text book but i think i have the old edition .. caz Pg 170 doesn't talk abt this
the edition i m tokin abt is the third one, it must be in urs as well, eider at the end of transport in mammals or the heart chapter.....btw i am a sister ...
 
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Can any1 help me with this question .... Please
http://postimg.org/image/3y9mahwpj/....
the answer is A because peptide bonds form only between COOH n NH2 grps which are attached to the central carbon atom. Grps 2 and 5 are part of the R grps of the two amino acids and hence cannot be involved in peptide bonding. these grps may be a part of the tertiary and quaternary structures of polypeptides dese amino acids may be a part of.
 
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