Q. Broker, Chow, Roberts and P. Sharp hybridized mRNA from adenovirus to denatured adenovirus DNA and examined the resultant duplex molecules by electron microscopy. Which of the following did they observe?

• (A) mRNA and DNA formed a continuous duplex throughout the length of the RNA
• (B) mRNA and DNA formed a continuous duplex throughout the length of DNA
• (C) On one strand there were looped out regions of single-stranded RNA
• (D) On one strand there were looped out regions of single-stranded DNA