Biology

4. a cellular machine made of RNA and protein that is responsible for protein synthesis
7. the basic unit of heredity
10. the passive movement of water
12. the central hub of an atom
13. a distinguishing quality or characteristic
15. an essential macronutrient for building and repairing tissues
18. the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
19. a protein that acts as a catalyst
21. a large geographical region characterized by a specific climate, distinct plant and animal life, and a unique ecosystem
22. a group of cells with a specific function
23. the total number of individuals in a group defined by certain characteristics
25. an individual animal, plant, or single-celled life form

1. process of cell division
2. convert carbon dioxide into oxygen
3. a community of living organisms
5. a group of people with shared characteristics
6. the fundamental unit of all living organisms
7. an organism's complete set of inherited genetic instructions
8. the process of breathing
9. an organelle in plant and algal cells that conducts photosynthesis
11. a structure in a living organism or a musical instrument
14. a basic unit of biological classification for a group of organisms
16. reduces a cell's chromosome number by half
17. a change in an organism's DNA sequence
20. one of two or more alternative versions of a gene that exist at a specific location on a chromosome
24. the molecule that contains the genetic instructions for the development