The structure of at the isoelectric point is: A) D) ...

[geodog55]

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

[uniquea123]

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]

Excellent

[cam1229]

Thanks for the timely response, appreciate it