GMAT Practice Question Set #24 (Question 70-72)

Sentence Correction Question #70: Pig Cells  
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Scientists have observed pig cells in the culture producing copies of the viral DNA using an electron microscope.

(A)

Scientists have observed pig cells in the culture producing copies of the viral DNA using an electron microscope.

(B)

In the culture, scientists have observed pig cells producing copies of the viral DNA using an electron microscope.

(C)

In the culture, scientists using an electron microscope have observed pig cells in the culture producing copies of the viral DNA.

(D)

Using an electron microscope, scientists have observed pig cells in the culture producing copies of the viral DNA.

(E)

Using an electron microscope in the culture, scientists have observed pig cells in the culture producing copies of the viral DNA.

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