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Author Question: The structure of at the isoelectric point is: A) D) B) E) C) ... (Read 87 times)

geodog55

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The structure of at the isoelectric point is:
   
  A)
   
 
  D)
   
 
  B)
   
 
  E)
   
 
  C)
   
 

Question 2

The isoelectric pH (pI) of is likely to be at a pH that is
   
  A)
  below pK1.
  B)
  at pK1.
  C)
  between pK1 and pK2.
  D)
  at pK2.
  E)
  above pK2.

Question 3

At the isoelectric point, the structure of methionine (2-amino-4-methylthiobutanoic acid) is:
  A)
   
 
  D)
   
 
  B)
   
 
  E)
   
 
  C)
   
 

Question 4

Based on the equilibria shown below, what is the net charge on structure IV?
   
   
  A)
  2
  B)
  1
  C)
  0
  D)
  +1
  E)
  +2

Question 5

Which of the following will migrate toward the positive electrode in an electrophoresis experiment?
   
   
   
   
   
   
  A)
  I
  B)
  II
  C)
  III
  D)
  I and III
  E)
  none will migrate

Question 6

Based on the pKa's of aspartic acid shown below, what is its approximate isoelectric point?
   
   
   
   
 
  A)
  2
  B)
  3
  C)
  5
  D)
  7
  E)
  10

Question 7

If an amino acid has one carboxyl group and one amino group, and the pKa's are 2.4 and 9.8 respectively, what is its isoelectric point?
  A)
  3.7
  B)
  6.1
  C)
  7.0
  D)
  7.9
  E)
  12.2



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uniquea123

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Answer to Question 1

b

Answer to Question 2

c

Answer to Question 3

d

Answer to Question 4

a

Answer to Question 5

b

Answer to Question 6

b

Answer to Question 7

b




geodog55

  • Member
  • Posts: 530
Reply 2 on: Aug 23, 2018
Great answer, keep it coming :)


bdobbins

  • Member
  • Posts: 326
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

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