Introns Were Discovered When MRNA for Adenovirus Protein Expressed in Mammalian

Introns were discovered when mRNA for adenovirus protein expressed in mammalian cells was hybridized to single-stranded virus DNA coding for that mRNA. When the complexes were observed under the electron microscope,

A) a completely double-stranded hybrid was seen.
B) a partial hybrid with loops of mRNA extending from the hybrid regions was seen.
C) a partial hybrid with loops of DNA extending from the hybrid regions was seen.
D) no hybrid was seen, because the introns had been removed.

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