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