Cells & Life

2. a membrane-bound organelle that uses light energy and makes food—a sugar called glucose—from water and carbon dioxide in a process known as photosynthesis.
8. a series of chemical reactions that convert the energy in food molecules into a usable form of energy called ATP.
11. the smallest unit of life.
13. a flexible covering that protects the inside of a cell from the environment outside the cell.
14. a cell that does not have a nucleus or other membrane-bound.
15. a microscope that uses a magnetic field to focus a beam of electrons through an object or onto an object’s surface.
17. the theory that states that all living things are made of one or more cells, the cell is the smallest unit of life, and all new cells come from preexisting cells.

1. the process by which new organisms are produced.
3. membrane-surrounded component of a eukaryotic cell with a specialized function.
4. a long chain of amino acid molecules; contains carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur.
5. an organism’s ability to maintain steady internal conditions when outside conditions change.
6. a cell that has a nucleus and other membrane-bound organelles.
7. part of a eukaryotic cell that directs cell activity and contains genetic information stored in DNA.
9. a microscope that uses light and lenses to enlarge an image of an object.
10. a living thing that is made up of two or more cells.
11. the liquid part of a cell inside the cell membrane; contains salts and other molecules.
12. a living thing that is made up of only one cell.
16. a stiff structure outside the cell membrane that protects a cell from attack by viruses and other harmful organisms.