Unit 1 Biology June 2012

1. DNA and RNA are polynucleotides composed of mononucleotides joined by





2. The mononucleotides of RNA consist of a phosphate joined to the sugar





3. The mononucleotides in mRNA are joined together by





4. The bases in RNA are





5. DNA is a double stranded molecule twisted into





6. The two DNA strands are held together by