Across
- 2. DNA is a double______ structure
- 4. Where polypeptides are located.
- 6. One base is left out.
- 9. One base is added
- 11. Pairs with adenine in RNA.
- 12. The building blocks of proteins.
- 14. Pieces of separate chromosomes are exchanged.
- 15. Proteins are made by ___________.
Down
- 1. Found in the red blood cells and carries 4 oxygen molecules throughout the body.
- 3. Pieces are replaced with each other.
- 5. A segment of DNA that codes for proteins or a trait.
- 7. ________ bond.
- 8. Start codon
- 10. Pairs with thymine.
- 13. Nitrogen bases that are NOT involved in the making of protein.