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*18. List at least five properties that DNA polymerases and RNA polymerases have in common. List at least three differences.

19. RNA molecules have three phosphates at the 5' end, but DNA molecules never do. Explain this difference.

20. An RNA molecule has the following percentages of bases: A = 23%, U = 42%, C = 21%, and G = 14%.

(a) Is this RNA single stranded or double stranded? How can you tell?

(b) What would be the percentages of bases in the template strand of the DNA that contains the gene for this RNA?

*21. The following diagram represents DNA that is part of the RNA-coding sequence of a transcription unit. The bottom strand is the template strand. Give the sequence found on the RNA molecule transcribed from this DNA and label the 5' and 3' ends of the RNA.

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