How to read this graph from C/P EK FL 1?

[daftypatty]

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I don't get why theres two lines for both ssDNA & dsDNA

 

[dushash]

It says separate trials were taken for each of ssDNA and dsDNA: electrode alone and in the presence of 0.5nM complementary ssDNA. So we should have 4 different lines. They are basically just testing conductivity. To be honest this is not hard, but it's for sure a dumb way to test knowledge. The only thing they are testing here is reading-comprehension. Ugh. I hate mcat for that. Test f*88ing knowledge, not language skills - at least not in C/P section. We have CARS for that. (sorry but this comes from a non-native speaker and I'm really fed up of how mcat does this test).

 

[Gibbward]

View attachment 195725
I don't get why theres two lines for both ssDNA & dsDNA

What kinds of questions are you asked for this figure?

I'm curious because it looks like the typical data you get from cyclic voltammetry experiments (ie. studies done using the potentiodynamic electrochemical apartus). One line is from the instrument analyzing your sample by increasing E/V from -0.1 to 0.6, and trying to find its reduction potential. At the end of the first "sweep", you're sample should be in its reduced state. Then, the second line is from the instrument analyzing your reduced sample by decreasing E/V from 0.6 to -0.1, and trying to oxidize your reduced sample to figure out the oxidation potential.

Now, I don't know if you really need to know all that to answer the questions provided for you...