2. A. There are three key differences between RNA and DNA 1. RNA is single stranded : DNA is double stranded 2. RNA is made of the sugar Ribose – DNA is made of deoxyribose 3. RNA has Uracil instead of Thymine – Both DNA and RNA have four nitrogen bases the difference is U vs T

3. B. RNA has the job of copying DNA C. The goal of RNA is to create proteins D. There are three types, each with a different job. 1. mRNA – Messenger RNA-copies DNA to take it out in the cytoplasm 2. rRNA – Ribosomal RNA-works on matching mRNA - to create the amino acids in the correct order 3. tRNA – Transfer RNA- gives amino acids to rRNA to produce the protein.

4. A. Creates a single RNA strand instead of a double DNA strand. B. Creates mRNA that can move out into the cytoplasm for the next step.

5. C. In mRNA, three nitrogen bases together form a code – this is called a codon. D. Looking ahead: 1. This code is matched with an amino acid. 2. A string of amino acids form a protein.

6. E. Some codons code for information other than amino acids 1. UAA is an example of a stop codon. 2. AUG is an example of a start codon. 3. NOTE: For every one codon, there is only ONE amino acid that can join.

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