Life Science Ch. 2 Vocab

5. A cell that lacks internal membrane bound structures like a nucleus
8. Solid, liquid, and gas and change due to temperature
9. The smallest unit of life
11. A small, membrane bound structure that performs services for cells
12. Holds organelles in place, maintains shape of cell, provides a system of “tracks” that motor proteins use to move cell products from place to place
14. Organelle that absorbs light energy and converts it into chemical energy for food during photosynthesis
17. A protein that directs cells to perform specific tasks
18. Jelly-like fluid made of water, salts, and dissolved organic molecules, Enclosed by cell membrane
20. Chemical combination of atoms of two or more the same element
21. Tough, rigid outer covering that protects and gives shape to the cell
22. Molecules that contain carbon and hydrogen
25. has a negative charge

1. Outer layer / coating of a cell that surrounds the cell and controls what enters or leaves the cell
2. Internal skeleton in cells made of networks of fibers
3. has no charge
4. has a positive charge
6. A protein that controls and speeds up chemical reactions without being changed or used up
7. Organelle that directs the cell's activities and stores DNA
10. Chemical combination of atoms of two or more different elements
13. A membrane bound cell that contains a membrane bound nucleus
15. An organelle made of protein and RNA that assemble proteins from amino acids
16. The smallest unit of an element made up of protons, neutrons, and electrons
19. An organelle that provides energy for processes of cells
23. One of the 118 different types of atoms of which all matter is composed
24. Provides healthy environment in the cell for many chemical reactions to occur