Biology Bonus

4. external changes to DNA that turn genes "on" or "off"
5. shows intermediate stages of organisms with small changes occurring over time
6. cell division that produces gametes
8. contains a nucleus and membrane-bound structures
10. the process by which cells become specialized
11. only in animal cells, help in cell division
13. controls all functions of the cell
15. the scientific study of heredity
17. what an organism's chromosomes look like
18. converts sugar into energy for the cell
19. makes protein
20. when cancer cells spread to new parts of the body

1. no nucleus or any other structure with a membrane around them
2. makes ribosomes
3. changes in organisms which are significant enough that, over time, the newer organisms would be considered an entirely new species
7. specific characteristics of an individual that are inherited
9. the delivery of characteristics from parent to offspring
12. when all organisms of a species have died
14. only in plant cells, converts light, carbon dioxide, and water into sugar
16. a permanent change in the nitrogen base sequence of a gene