Page 97 - Science Course 1 (Book 1)

3. the state a substance is in when the concentration of the substance is the same on
both sides of a cell membrane.
4. when a cell takes in a substance by surrounding it with the cell membrane.
5. the diffusion of water molecules only.
6. when molecules pass through a cell membrane using special proteins.
7. transport proteins that form pores through a cell membrane.
8. the movement of substances through a cell membrane by using the cell’s energy.
9. proteins that assist with the transport of molecules through a cell membrane.
10. when a cell’s vesicles release their contents outside the cell.
11. what a cell membrane is because it allows only certain substances to enter or leave a cell.
12. the movement of substances through a cell membrane without using the cell’s energy.

Mo3-L5: Key Concept Check

Directions: Answer each question on the lines provided. Use complete sentences.

1. What is active transport?

2. What is endocytosis?

3. What is exocytosis?

4. How does a cell use endocytosis to form a vesicle?

5. How does a cell use exocytosis to release the contents of a vesicle outside the cell?

6. What role does cellular energy play in active transport?

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