Cell Transport Review Worksheet for biology students to practice understanding of cellular transport mechanisms.

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Let’s go through each section of the worksheet and fill it out correctly with explanations.

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Part 1: Complete the table by checking the correct column for each statement

| Statement | Passive transport | Active transport |
|---------|-------------------|------------------|
| 1. Moves substances from an area of high concentration to an area of low concentration | ✔ | |
| 2. Requires energy (ATP) | | ✔ |
| 3. Does not require energy | ✔ | |
| 4. Involves movement across a membrane without direct use of ATP | ✔ | |
| 5. Involves movement across a membrane using ATP | | ✔ |
| 6. Includes diffusion, osmosis, and facilitated diffusion | ✔ | |
| 7. Includes endocytosis and exocytosis | | ✔ |
| 8. Movement of water through a semipermeable membrane | ✔ | |

> ✔ = Correct answer

Explanation:
- Passive transport: No energy required; moves substances down their concentration gradient (high → low). Includes diffusion, osmosis, and facilitated diffusion.
- Active transport: Requires energy (ATP); moves substances against their concentration gradient (low → high). Includes processes like the sodium-potassium pump and endocytosis/exocytosis.

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Part 2: Match the term with the correct description

Match these terms:
a. active transport
b. energy
c. endocytosis
d. exocytosis
e. equilibrium
f. passive transport
g. osmosis
h. selective permeability
i. cell membrane

Now match them to the descriptions:

1. Transport process that provides a tube-like opening in the plasma membrane through which particles can diffuse → i. cell membrane
*(The cell membrane allows diffusion through its structure.)*

2. Is used during active transport but not passive transport → b. energy
*(Active transport requires ATP; passive does not.)*

3. Process by which a cell takes in material by forming a vesicle around it → c. endocytosis
*(Endocytosis brings materials into the cell via vesicles.)*

4. Particle movement from an area of higher concentration to an area of lower concentration → f. passive transport
*(This is the definition of passive transport.)*

5. Property by which a cell keeps wastes from a recycle → h. selective permeability
*(Selective permeability means the membrane allows some substances in/out while blocking others — including waste.)*

6. A form of passive transport that uses transport proteins → g. osmosis or f. passive transport?
Wait — let's clarify: Osmosis is a type of passive transport involving water. But "uses transport proteins" refers more specifically to facilitated diffusion. Since "facilitated diffusion" isn’t listed, we might need to reconsider.

But looking at options: The only one that fits “passive transport using transport proteins” is likely g. osmosis, but osmosis doesn’t always use proteins (it can happen through lipid bilayer).

Actually, facilitated diffusion is the best fit, but it's not listed. So perhaps this is a trick.

Wait — rechecking: The choices are:
a. active transport
b. energy
c. endocytosis
d. exocytosis
e. equilibrium
f. passive transport
g. osmosis
h. selective permeability
i. cell membrane

So if the question says: "A form of passive transport that uses transport proteins" → This describes facilitated diffusion, but it's not among the options. However, osmosis sometimes involves aquaporins (transport proteins), so it could be acceptable.

But better: Let’s assume the intended answer is f. passive transport — because passive transport includes facilitated diffusion, which uses transport proteins.

But wait — maybe the correct answer is g. osmosis, since it’s a specific type of passive transport that can involve proteins.

Alternatively, perhaps there's a typo — but given the options, f. passive transport is safest.

But let's look at the next one:

7. Particle movement from an area of lower concentration to an area of higher concentration → a. active transport
*(This requires energy and goes against the gradient.)*

8. Process that must change shape in order to transport particles → c. endocytosis or d. exocytosis
*(Both involve membrane changes. But “must change shape” refers to the membrane forming vesicles. Both do, but the best single answer is c. endocytosis or d. exocytosis — but since both are listed, perhaps the answer is c. endocytosis if it's about taking in.)*

But actually, both involve membrane shape change. But the question says “the process”, singular.

Possibly, c. endocytosis is the intended answer.

Wait — perhaps it's d. exocytosis? Both are valid.

But the most common example is endocytosis — cells engulfing material.

But let's move on.

Revisiting:

Let me re-match carefully:

1. Transport process that provides a tube-like opening in the plasma membrane through which particles can diffuse → i. cell membrane
*(Yes — the membrane itself forms the barrier and allows diffusion.)*

2. Is used during active transport but not passive transport → b. energy
*(Correct. ATP is needed for active transport.)*

3. Process by which a cell takes in material by forming a vesicle around it → c. endocytosis
*(Correct.)*

4. Particle movement from an area of higher concentration to an area of lower concentration → f. passive transport
*(Correct.)*

5. Property by which a cell keeps wastes from a recycle → h. selective permeability
*(Yes — the membrane selectively allows passage.)*

6. A form of passive transport that uses transport proteins → g. osmosis? Or f. passive transport?

But osmosis is passive transport of water, and often uses aquaporins (proteins), so g. osmosis is acceptable.

But technically, facilitated diffusion is the general term — but not listed.

However, g. osmosis is a subtype of passive transport that uses transport proteins.

So likely: g. osmosis

7. Particle movement from an area of lower concentration to an area of higher concentration → a. active transport
*(Correct.)*

8. Process that must change shape in order to transport particles → c. endocytosis or d. exocytosis

But both involve shape change. But endocytosis is the process where the cell membrane invaginates to form a vesicle — so it changes shape.

Similarly, exocytosis involves fusion of vesicles with membrane.

But the best answer is likely c. endocytosis — as it's the classic example.

Alternatively, if it's about the vesicle changing shape, maybe d. exocytosis.

But both are valid.

But given the wording “must change shape,” it's probably referring to endocytosis — the membrane folds inward.

So c. endocytosis

Wait — but d. exocytosis also involves shape change.

But perhaps the answer is c. endocytosis

Let’s proceed.

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Part 3: Match the term with the correct description

Now match:

a. active transport
b. passive transport
c. endocytosis
d. exocytosis
e. equilibrium
f. osmosis
g. selective permeability
h. cell membrane

Now the statements:

9. The diffusion of water through a cell membrane → f. osmosis
*(Definition of osmosis.)*

10. Used to help substances enter or exit the cell membrane → h. cell membrane
*(The membrane facilitates entry/exit.)*

11. When energy is required to move molecules through a cell membrane → a. active transport
*(Correct.)*

12. When the molecules of one substance are spread evenly throughout another substance to become balanced → e. equilibrium
*(At equilibrium, concentrations are equal.)*

13. Small membrane-bound sacs (becomes a part of the cell membrane when the contents are released) → d. exocytosis
*(Exocytosis releases vesicles into extracellular space.)*

14. The cell membrane forms around another substance, for example, how the amoeba gets its food → c. endocytosis
*(Amoebas use phagocytosis, a form of endocytosis.)*

15. When molecules move from an area of high concentration to an area of low concentration → b. passive transport
*(Correct.)*

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✔ Final Answers:

#### Part 1: Table
| Statement | Passive transport | Active transport |
|---------|-------------------|------------------|
| 1. Moves substances from high to low concentration | ✔ | |
| 2. Requires energy (ATP) | | ✔ |
| 3. Does not require energy | ✔ | |
| 4. No ATP used | ✔ | |
| 5. Uses ATP | | ✔ |
| 6. Diffusion, osmosis, facilitated diffusion | ✔ | |
| 7. Endocytosis, exocytosis | | ✔ |
| 8. Water movement through membrane | ✔ | |

#### Part 2: Matching
1. i. cell membrane
2. b. energy
3. c. endocytosis
4. f. passive transport
5. h. selective permeability
6. g. osmosis *(or possibly f. passive transport — but osmosis is more specific)*
7. a. active transport
8. c. endocytosis *(or d. exocytosis — but endocytosis is more typical)*

But wait — let's double-check #6:
"A form of passive transport that uses transport proteins" → This is facilitated diffusion, but it's not listed.
Osmosis can use aquaporins (transport proteins), so g. osmosis is acceptable.

Alternatively, f. passive transport is broader — but it doesn't specify protein use.

So best answer: g. osmosis

#8: "Process that must change shape..." → c. endocytosis — the membrane folds inward.

#### Part 3: Matching
9. f. osmosis
10. h. cell membrane
11. a. active transport
12. e. equilibrium
13. d. exocytosis
14. c. endocytosis
15. b. passive transport

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✔ Summary of Answers:

Part 1 Table:
1. Passive
2. Active
3. Passive
4. Passive
5. Active
6. Passive
7. Active
8. Passive

Part 2 Matching:
1. i
2. b
3. c
4. f
5. h
6. g
7. a
8. c

Part 3 Matching:
9. f
10. h
11. a
12. e
13. d
14. c
15. b

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🔍 Explanation of Key Concepts:

- Passive transport: No energy needed. Moves substances down concentration gradient. Includes:
- Simple diffusion
- Osmosis (water diffusion)
- Facilitated diffusion (via carrier proteins)

- Active transport: Requires energy (ATP). Moves substances against gradient. Examples:
- Sodium-potassium pump
- Endocytosis (cell eats)
- Exocytosis (cell spits out)

- Endocytosis: Cell engulfs material → forms vesicle (phagocytosis, pinocytosis)
- Exocytosis: Vesicle fuses with membrane → releases contents
- Osmosis: Water movement across membrane
- Equilibrium: Equal concentration on both sides
- Selective permeability: Membrane allows certain substances through

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