PH 142-Spring 2018 Midterm Exam 1 Total 125 Points Question 3 (1S Points) protci

Question

PH 142-Spring 2018 Midterm Exam 1 Total 125 Points Question 3 (1S Points) protcin molecule in an charge on the pretphoresis gel has a negative charge The amount of exess typical. ends on the pH of the solution, but an excess of 30 electrons in field of l s c placed n an coernio 1500 N C (10 points) Force 500 N lCox esror Ey mort Porre on protein (b) How are the direction of the electric field and the force on the protein related? (5 points) the loe en the prolein deotases soe as lt o the electric Fre moes tonarde electric Pi

Explanation / Answer

a protein molecule in an electrophoresis has a negtive charge.

toal charge q = 30 x 1.6 x 10^-19 C

electric field E =1500 N/C

F = Eq

F = 1500 x 30 x 1.6 x 10^-19

F = 7.2 x 10^-15 N

the force on a protein molecule is decreases as if it is moves towards electric field.

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