Across
- 2. Large biological molecules essential for life, including carbohydrates, lipids, proteins, and nucleic acids.
- 5. Generation An outdated theory that life arises from nonliving matter.
- 6. Single-celled prokaryotes similar to bacteria but genetically distinct and often found in extreme environments.
- 8. The theory that living organisms arise only from other living organisms.
- 10. Acids Informational macromolecules (DNA and RNA) that store and transmit genetic information.
- 11. Microorganisms that cause disease in humans or other organisms.
- 12. Cells that do not have a nucleus or membrane-bound organelles; includes bacteria and archaea.
- 13. Macromolecules made of glycerol and fatty acids that store energy and make up cell membranes.
- 14. Polymers made of amino acids that perform many functions such as enzymes and antibodies.
- 16. Infectious, nonliving proteins that contain no nucleic acid and cause diseases such as mad cow disease.
Down
- 1. Tiny living organisms that include bacteria, archaea, protozoa, fungi, algae, and microscopic stages of worms; viruses and prions are exceptions because they are nonliving.
- 3. Single-celled, prokaryotic microorganisms that lack a nucleus and membrane-bound organelles.
- 4. Carbohydrate polymers made of many sugar units that store energy and provide structural support in cells.
- 7. Nonliving, acellular particles made of DNA or RNA surrounded by a protein coat that must infect a host cell to reproduce.
- 9. A branch of biology that studies microorganisms, which are living things too small to be seen without a microscope.
- 15. Cells that contain a nucleus and membrane-bound organelles; found in organisms like fungi, protozoa, algae, plants, and animals.