Across
- 2. The organelle that contains enzymes to break down or digest or organic materials
- 3. A chemical substance made by the body to help destroy an invading pathogen
- 4. The nucleic acid responsible for carrying the genetic information of most organisms from one generation to the next
- 9. The ability to continue on using the present amount of material
- 13. An element that has some properties of a metal and some properties of a nonmetal
- 17. What occurs when bacteria develop a tolerance to survive treatment with drugs that once killed them
- 18. A substance that conducts heat and electricity
- 20. An immune system response to proteins in certain substances such as foods
Down
- 1. A bond formed when two atoms share electrons, water is an example
- 5. A water environment
- 6. The study of the composition of substances and changes they undergo
- 7. Anything that changes the DNA of an organism
- 8. A chemical that is not formed in nature and is made by chemists
- 10. A scientist that studies microbes
- 11. Metals that are able to be hammered and shaped or rolled into thin sheets
- 12. Fluid, mostly of water that fills most of the space within a cell
- 14. Information gathered during a scientific investigation
- 15. An element that does not conduct electricity or heat and is usually a gas at room temperatures
- 16. A sample collected in such a way that all elements of a population are not equally represented;such a sample does not accurately represent the population
- 19. Each repetition of an experiment