Biology Crossword puzzle

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Across
  1. 2. A small infectious agent that replicates inside living cells.
  2. 3. Single-celled eukaryotic organisms.
  3. 4. A structure made of DNA and protein, containing genes.
  4. 9. A warm-blooded vertebrate animal with hair and mammary glands.
  5. 12. Different forms of a gene.
  6. 13. A segment of DNA that codes for a protein.
  7. 14. An organism whose cells contain a nucleus.
  8. 15. A protein that speeds up chemical reactions.
  9. 17. The powerhouse of the cell, producing energy.
Down
  1. 1. A group of spore-producing organisms feeding on organic matter.
  2. 2. An animal with a backbone.
  3. 4. The jelly-like substance within a cell.
  4. 5. Specialized structures within a cell.
  5. 6. The organelle that contains the cell's genetic material.
  6. 7. The site of protein synthesis.
  7. 8. An organism whose cells lack a nucleus.
  8. 10. A single-celled prokaryotic organism.
  9. 11. Membrane The protective outer layer of a cell.
  10. 16. Ribonucleic acid, involved in protein synthesis.
  11. 18. Deoxyribonucleic acid, the molecule carrying genetic instructions.