DAT Destroyer (2018 edition) - Biology help!

[Elvisthepelvis]

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Hello! This is my first time using the website so I hope I'm doing this correctly...

So on #109 of the biology section of the DAT Destroyer (2018 edition) it says that "Ions diffuse across membranes, down their concentration gradient". This is a false statement (which was the correct answer for that question). In order to make it true, should it say that they travel down their electrochemical gradient?

Thanks! This site has helped me so much! Explanations are much appreciated!

 

[DAT Destroyer]

The problem asks for a false statement. D is false.