Cell Transport Worksheet | PDF | Cell Membrane | Osmosis - Free Printable

Cell Transport Review Solution

#### Part 1: Matching Definitions with Terms
Match the definition on the left with the term on the right.

1. Large wastes or cell products are released from inside to outside a cell
- Answer: d. Exocytosis
- Explanation: Exocytosis is the process by which cells expel large molecules, such as waste products or secretions, by enclosing them in vesicles and fusing the vesicle membrane with the plasma membrane.

2. Diffusion of water molecules through a selectively permeable membrane
- Answer: e. Osmosis
- Explanation: Osmosis is the specific type of diffusion where water molecules move across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

3. The transport of particles which requires the use of energy
- Answer: f. Active transport
- Explanation: Active transport involves the movement of molecules against their concentration gradient, requiring energy (usually ATP).

4. A state reached when particles continue to move but in equal amounts in and out of the cell
- Answer: c. Dynamic equilibrium
- Explanation: Dynamic equilibrium occurs when the rate of particles moving into the cell equals the rate of particles moving out, resulting in no net change in concentration.

5. Large particles are surrounded by the membrane and taken into the cell
- Answer: g. Endocytosis
- Explanation: Endocytosis is the process by which cells engulf large particles or substances by surrounding them with the plasma membrane and forming a vesicle.

6. Movement of any particles from an area of higher concentration to one of lower concentration, with the concentration gradient
- Answer: b. Diffusion
- Explanation: Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

7. The transport of particles which does not require energy
- Answer: a. Passive transport
- Explanation: Passive transport includes processes like diffusion, osmosis, and facilitated diffusion, which do not require energy input.

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#### Part 2: Circle the Word or Phrase That Best Completes the Statement or Answers the Question

8. The structure most responsible for maintaining cell homeostasis is the
- Answer: plasma membrane
- Explanation: The plasma membrane regulates the movement of substances in and out of the cell, maintaining internal balance (homeostasis).

9. The plasma membrane (cell membrane) is made up of a(n)
- Answer: phospholipid bilayer
- Explanation: The plasma membrane is primarily composed of a phospholipid bilayer, which forms the basic structure and provides selective permeability.

10. Which of the following is NOT a form of passive transport?
- Answer: endocytosis
- Explanation: Endocytosis requires energy and is therefore not a form of passive transport. Passive transport includes diffusion, osmosis, and facilitated diffusion.

11. Diffusion continues until
- Answer: equilibrium is reached
- Explanation: Diffusion stops when the concentration of particles is equal on both sides, achieving dynamic equilibrium.

12. If a cell is placed in salt water, water leaves the cell by
- Answer: osmosis
- Explanation: In salt water, the solute concentration outside the cell is higher, so water moves out of the cell by osmosis to equalize the concentrations.

13. A cell moves particles from a region of low concentration to a region of high concentration by
- Answer: active transport
- Explanation: Moving particles against their concentration gradient requires energy, which is characteristic of active transport.

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#### Part 3: For Each Scenario, Answer the Questions and Draw an Arrow to Illustrate the Movement of Molecules

14. Easter egg coloring:
- A blue food coloring tablet is placed in a cup of vinegar and water. After several seconds, the blue tablet will begin to dissolve and will eventually spread evenly throughout the liquid.

a. The blue dye is traveling from a _______ to a _______ concentration.
- Answer: high to low
- Explanation: The blue dye starts concentrated in the tablet and spreads out into the surrounding liquid, moving from a high concentration to a low concentration.

b. Identify the type of transport illustrated in this scenario:
- Answer: Diffusion
- Explanation: The spreading of the blue dye is due to the random movement of molecules from an area of high concentration to an area of low concentration, which is diffusion.

c. Does this movement of particles require energy?
- Answer: No
- Explanation: Diffusion is a passive process that does not require energy.

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Final Answer Summary

1. d. Exocytosis
2. e. Osmosis
3. f. Active transport
4. c. Dynamic equilibrium
5. g. Endocytosis
6. b. Diffusion
7. a. Passive transport

8. plasma membrane
9. phospholipid bilayer
10. endocytosis
11. equilibrium is reached
12. osmosis
13. active transport

14.
a. high to low
b. Diffusion
c. No

Boxed Final Answer:
\boxed{
\begin{array}{ll}
1. & \text{d. Exocytosis} \\
2. & \text{e. Osmosis} \\
3. & \text{f. Active transport} \\
4. & \text{c. Dynamic equilibrium} \\
5. & \text{g. Endocytosis} \\
6. & \text{b. Diffusion} \\
7. & \text{a. Passive transport} \\
8. & \text{plasma membrane} \\
9. & \text{phospholipid bilayer} \\
10. & \text{endocytosis} \\
11. & \text{equilibrium is reached} \\
12. & \text{osmosis} \\
13. & \text{active transport} \\
14. & \text{a. high to low, b. Diffusion, c. No} \\
\end{array}
}