CR Electrophoresis and SDS-Page video Quiz 3 Q4

alexpie
Posts: 17
Joined: Sat May 06, 2017 7:27 pm

CR Electrophoresis and SDS-Page video Quiz 3 Q4

Postby alexpie » Tue Jun 06, 2017 11:06 pm

Help! I am very confused. I thought gel-electrophoresis acts like an electrolytic cell. Because of this, the cathode should be negative and the anode should be positive; however, on the quiz it states that during gel-electrophoresis with SDS-PAGE, the cathode is positive. What is the correct way thinking about this?
NS_Tutor_Andrew
Site Admin
Posts: 521
Joined: Mon May 23, 2016 1:47 pm

Re: CR Electrophoresis and SDS-Page video Quiz 3 Q4

Postby NS_Tutor_Andrew » Wed Jun 07, 2017 6:27 pm

Hi alexpie,

You're 100% correct -- we'll post a fixed video ASAP. Thanks for pointing that out!

Parenthetically, this discussion on StackExchange about this issue is surprisingly good, and may be worth skimming through: https://chemistry.stackexchange.com/questions/16785/positive-or-negative-anode-cathode-in-electrolytic-galvanic-cell.
Andrew D.
Content Manager, Next Step Test Prep.

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