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Kaplan Qbank USMLE



Author7 Posts
  #1

Peptide bond

a.-has partial double-bond character
b.-is ionized at physiologic pH
c.-is cleaved by agents that denature proteins,such as organic solvents and high concentrations of urea
d.-is stable to heating is strong acids
e.-occurs most commonly in the the cis configuration

shocked

  #2

a is correct i think..
peptide bond is uncharged and polar...not cleaved by denaturing agents,only prolonged exposure leads to its hydrolysis and lastly it occurs in trans configuration....
am i right...

  #3

yes you are correct
and thanks for the brief explanation

  #4

A

  #5

smiling face

  #6

gud explnation pkaur

  #7

It's a very complicated explination

2 electrons tend to migrate from the Nitrogen's outer orbitals to the former single bond between N and C of the peptide bond and 2 e- from the double bond C=O tend to move in the outer orbitals of O making it O-. So, the peptide bod is always shifting from double to single bond, making it not a single, nor a double, but a partially double bond.

It was very chalenging to try to explain this...







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