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Kaplan Qbank USMLE



Author6 Posts
  #1

If you want to break down the histones of DNA ,what enzymes should you use?

1- Trysin + Chymotrysin
2- Carboxypeptidase A + Carboxypedtidase B
3- Carboxypeptidase B + Trypsin
4- Elastase + chymotrypsin

  #2

1 ??

  #3

No

  #4

3 ?? :cry:

  #5

yes!!!!!!!
because: Histone are compoused of Lysine and Arginenes and
Trypsin= endopeptidase for Arginine and lysine
Carboxopeptidase B(basic)=exopeptidase for these AAs

  #6

thanks good point smiling face







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