1. Regulates what enters and exits the cell; provides structural support and protection.
2. protein
3. Because it is made of many different components (like phospholipids, proteins, carbohydrates) arranged in a pattern resembling a mosaic.
4. a. lipid bilayer — the double layer of phospholipids forming the main structure. b. protein channel — embedded proteins that form pores for transport. c. carbohydrate chains — sugar molecules attached to proteins or lipids on the outer surface.
5. Plants, fungi, and bacteria.
6. Provides structural support and protection; helps maintain cell shape and prevents bursting.
7. Cellulose (in plants); chitin (in fungi); peptidoglycan (in bacteria).
8. regulate; substances
9. homogeneous mixture
10. The passive movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.
11. equilibrium
12. random; does not
13. permeable
14. The diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
15. Isotonic means equal solute concentration inside and outside the cell. Hypertonic means higher solute concentration outside the cell. Hypotonic means lower solute concentration outside the cell.
16. osmosis; turgid
17. Cell wall
18. transport proteins
19. facilitated diffusion
Parent Tip: Review the logic above to help your child master the concept of 9th grade biology worksheet.
