TBR Physics Electrostatics and Electromagnetism, Q11 of 25, Help!

[defygrav1ty]

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Maybe I am missing something, but I don't know why A is correct, not D.
If D=a-b(log M), then shouldn't the graph of distance (D) vs log M increase (a and b are constants that depend on electrophoretic conditions)? The answer, A, is showing a negative slope.

Please help!

 

[1TB4RKSB4CK]

M is mass of the fragment so as log M is decreased, (smaller fragment) the distance is can travel increases. This is inverse of a larger fragment with a larger log M, in which case the distance of it would be hindered in the gel. That's how I looked at it. D doesn't make since in retrospect, electrophoresis under a constant supply in a span of x amount of time wouldn't cause a deviation like that.

 

[defygrav1ty]

M is mass of the fragment so as log M is decreased, (smaller fragment) the distance is can travel increases. This is inverse of a larger fragment with a larger log M, in which case the distance of it would be hindered in the gel. That's how I looked at it. D doesn't make since in retrospect, electrophoresis under a constant supply in a span of x amount of time wouldn't cause a deviation like that.

Thanks for replying! I walked away from the problem and came back...made sense.