Question

cell membrane with passive and active transportation

1. what’s able to move into the cell?
2. what’s able to move out of the cell?
3. what is this principle called?

molecules will always move from high to low without requiring any energy. this is called passive transport.
below is a domino. the line in the middle represents a selectively permeable membrane.

1. which side has a higher concentration? put an h underneath it.
2. which side has a lower concentration? put an l underneath it.
3. next draw an arrow that goes in the direction of h to l. molecules will always move from h to l

molecules will move on their own from high concentration (number) to low concentration (number) until there are equal amounts on both sides. movement will continue in equal and opposite directions. this is called dynamic equilibrium.

1. use the arrows to show dynamic equilibrium below.

Explanation:

Step1: Identify substances moving into cell

Small non - polar molecules like oxygen, and some water molecules can move into the cell by passive transport. Ions and larger polar molecules may require active transport to enter. But generally, for passive transport, small hydrophobic molecules and water (by osmosis) can move in.

Step2: Identify substances moving out of cell

Waste products like carbon dioxide, and some ions that are being pumped out for maintaining cell homeostasis can move out of the cell. Water can also move out depending on the osmotic gradient.

Step3: Name the principle

The principle of molecules moving from high to low concentration without energy is called passive transport.

Step4 - 6: Determine concentration sides

For each domino - like diagram, count the number of dots on each side of the membrane. The side with more dots has a higher concentration (put an H) and the side with fewer dots has a lower concentration (put an L), then draw an arrow from H to L.

Step7: Show dynamic equilibrium

For each diagram, when the number of dots on both sides of the membrane is equal, draw two arrows of equal length pointing in opposite directions to show that molecules are still moving but there is no net change in concentration.

Answer:

1. Small non - polar molecules (e.g., oxygen), water (by osmosis), some ions (if facilitated diffusion) can move into the cell.
2. Waste products (e.g., carbon dioxide), some ions, water can move out of the cell.
3. Passive transport.

4 - 6: For each domino diagram, follow the dot - counting and marking procedure as described.
7: For each diagram with equal dots on both sides, draw two equal - length opposite - direction arrows.