1. DNA Journal

2. New Journal: Draw a model of DNA

3. What are the base pair rules for DNA? Adenine – Thymine Adenine – Thymine Cytosine – Guanine Cytosine – Guanine

4. What are some differences between DNA and RNA? DNA-double helix DNA-double helix RNA- single strand RNA- single strand DNA- sugar=deoxyribose DNA- sugar=deoxyribose RNA- sugar=ribose RNA- sugar=ribose DNA- base Thymine DNA- base Thymine RNA- base Uracil RNA- base Uracil

5. Define virulent. Able to cause disease. Able to cause disease.

6. What are the three types of RNA? mRNA (messenger) mRNA (messenger) tRNA (transfer) tRNA (transfer) rRNA (ribosomal) rRNA (ribosomal)

7. Compare a codon to an anticodon. Codon: a three nucleotide sequence on mRNA Codon: a three nucleotide sequence on mRNA Ex: AGC Ex: AGC Anticodon: a three nucleotide sequence on tRNA Anticodon: a three nucleotide sequence on tRNA Ex: UCG Ex: UCG

8. A(n) ____________________ ____________________ is the amount of time required for one-half the number of radioactive isotopes in a sample to decay, forming stable elements. Half-life Half-life

9. Natural selection is the process by which organisms with traits well suited to their environment survive and reproduce at a greater rate than less well-adapted organisms in the same environment. organisms with traits well suited to their environment survive and reproduce at a greater rate than less well-adapted organisms in the same environment.