ACT Science 4.1 Research Summary Passage
ACT Science: Research Summary Passage Drill 4, Problem 1. What was the primary purpose of using SDS-PAGE?
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Sounds like we’re being asked why SDS-PAGE was used at all.
Thankfully, that was stated right there in the opening paragraph. The opening sentence, even!
Aaaand of the four options, option B is nearly that exact same sentence. Read it!
“To separate the proteins in the protein sample by size.”
Before we call it a day, however, it’s always wise to check the other answers and make sure they’re wrong.
Option A says SDS-PAGE’s purpose was to separate DNA.
There’s nothing about DNA mentioned at all in the passage. No dice there.
Option C says SDS-PAGE was used to separate proteins by their charge.
Nothing about charge in there, either. Frankly, to even suggest it is… shocking.
Option D says SDS-PAGE was used to identify known and unknown proteins by staining.
While staining does occur as part of the SDS-PAGE process,
that’s not the purpose of using SDS-PAGE.
By the way, staining can also be used to determine whether more housetraining is necessary.
But no, option B will be just fine.