biology

1. A cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another.
6. A system of membranes that modifies and packages proteins for export by the cell
8. Energy-rich organic compounds, such as fats, oils, and waxes, that are made of carbon, hydrogen, and oxygen.
9. transport the movement of materials through a cell membrane using energy
10. An organelle found in plant and algae cells where photosynthesis occurs
12. The study of life
13. A type of protein that speeds up a chemical reaction in a living thing
14. Diffusion of water through a selectively permeable membrane
17. organelle containing digestive enzymes
18. A rigid layer of nonliving material that surrounds the cells of plants and some other organisms.
20. compoundmade up of carbon, hydrogen, and oxygen atoms; major source of energy for the human body
21. cell structure that controls which substances can enter or leave the cell.

2. Energy-requiring process that moves material across a cell membrane against a concentration difference
3. An organelle found in plant and algae cells where photosynthesis occurs
4. Cell organelle that stores materials such as water, salts, proteins, and carbohydrates
5. Cell organelle that converts the chemical energy stored in food into compounds that are more convenient for the cell to use
7. containing hydrogen, oxygen, nitrogen, carbon, and phosphorus
11. site The part of an enzyme or antibody where the chemical reaction occurs.
15. A simple compound whose molecules can join together to form polymers
16. Control center of the cell
19. The basic unit of life and the building block of tissues and organs