Question

build a membrane challenge

1. the cell membrane is also called a plasma membrane. what would happen to cells without a cell membrane?
2. what molecules cannot easily pass through the cell membrane?
3. what is the difference between a polar and nonpolar molecule?
4. insert channel proteins into the cell membrane and observe. why were substances transported up until there were equal amounts on both side of the membrane?
5. diffusion is a process where substances move from a higher to lower concentration. what type of diffusion happens through a channel protein?
6. what does a cell have to do to move a substance from an area of low concentration to an area with high concentration?
7. what is the name of the process that uses carrier proteins and atp to transport materials against the concentration gradient?
8. why do cells have different membrane carbohydrates?

diffusion challenge

1. when has a cell reached dynamic equilibrium?
2. what is the passive movement of particles from a higher to lower concentration called?

Explanation:

1. The cell membrane is crucial for maintaining cell integrity, regulating transport, and communication. Without it, the cell contents would disperse, and it couldn't maintain homeostasis.
2. Large, polar, and charged molecules cannot easily pass through the non - polar lipid bilayer of the cell membrane.
3. A polar molecule has an uneven distribution of charge due to differences in electronegativity of atoms, while a non - polar molecule has an even charge distribution.
4. Substances are transported until there is equal amount on both sides of the membrane to reach equilibrium, following the concentration gradient.
5. The diffusion through a channel protein is called facilitated diffusion.
6. To move a substance from low to high concentration, a cell has to use energy (ATP) and carrier proteins in a process called active transport.
7. The process that uses carrier proteins and ATP to transport materials against the concentration gradient is called active transport.
8. Cells have different membrane carbohydrates for cell - cell recognition, cell adhesion, and as receptors for signaling molecules.
9. A cell has reached dynamic equilibrium when the rate of substance movement into the cell is equal to the rate of movement out of the cell.
10. The passive movement of particles from a higher to lower concentration is called diffusion.

Answer:

1. The cell contents would disperse and it couldn't maintain homeostasis.
2. Large, polar, and charged molecules.
3. Polar has uneven charge distribution, non - polar has even charge distribution.
4. To reach equilibrium following the concentration gradient.
5. Facilitated diffusion.
6. Use energy (ATP) and carrier proteins (active transport).
7. Active transport.
8. For cell - cell recognition, adhesion, and as signaling receptors.
9. When the rate of substance movement in equals the rate out.
10. Diffusion.