Biology

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Across
  1. 1. - A structure of DNA and protein that carries genetic information.
  2. 3. - A chemical substance produced in the body that controls and regulates the activity of cells or organs.
  3. 5. - A community of living organisms and their physical environment interacting as a system.
  4. 7. - The cell formed by the fusion of a sperm and an egg cell.
  5. 9. - A close and long-term biological interaction between two different species.
  6. 13. - The genetic makeup of an organism.
  7. 14. - The basic structural and functional unit of all living organisms.
  8. 15. - The process of producing genetically identical individuals.
  9. 18. - The process by which plants convert sunlight into chemical energy.
  10. 19. - An individual living thing.
  11. 20. - The movement of water molecules through a selectively permeable membrane.
  12. 22. - The membrane-bound organelle that contains the cell’s chromosomes.
  13. 23. - A group of similar cells that perform a specific function.
  14. 24. - The organelle in plant cells where photosynthesis occurs.
  15. 25. - The ability of an organism to maintain stable internal conditions.
  16. 27. - A trait that helps an organism survive and reproduce in its environment.
  17. 29. - A change in the DNA sequence of a gene.
Down
  1. 2. - The branch of biology that studies interactions between organisms and their environment.
  2. 4. - A microscopic infectious agent that can only replicate inside living cells.
  3. 6. - A protein that acts as a biological catalyst, speeding up reactions in living organisms.
  4. 8. - The process by which species change over time through natural selection.
  5. 10. - The set of life-sustaining chemical reactions in organisms.
  6. 11. - The physical characteristics or traits of an organism.
  7. 12. - Single-celled microorganisms that can be beneficial or harmful.
  8. 13. - A segment of DNA that codes for a specific protein or trait.
  9. 16. - A group of organisms that can interbreed and produce fertile offspring.
  10. 17. - A type of cell division that reduces the chromosome number by half, producing four gamete cells.
  11. 21. - The powerhouse of the cell, responsible for producing energy.
  12. 26. - The molecule that carries genetic information in living organisms.
  13. 28. - A nerve cell responsible for transmitting signals in the nervous system.