This biology worksheet helps students review key concepts of cellular transport, including osmosis and active transport mechanisms.

It looks like you've uploaded a worksheet titled "Cellular Transport and the Cell Cycle" from a biology textbook or study guide (Chapter 8, Section 8.1). The task involves matching terms in Column A with their correct definitions in Column B, focusing on cellular transport mechanisms.

Let’s solve this step by step.

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Column A (Terms)

We need to match each term with its definition from Column B.

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#### 1. Transport protein that provides a cellular opening in the plasma membrane through which particles can diffuse

- This describes a channel protein — a type of transmembrane protein that forms a pore allowing specific molecules (like ions) to pass through the membrane via passive diffusion.
- ✔ Match: h. channel protein

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#### 2. Used during active transport but not passive transport

- Active transport requires energy (ATP), whereas passive does not.
- So, what is used in active transport but not passive? Energy
- ✔ Match: a. energy

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#### 3. Process by which a cell expels waste from a vesicle

- This is exocytosis — the process where vesicles fuse with the plasma membrane to release contents outside the cell.
- ✔ Match: e. exocytosis

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#### 4. Particle movement from an area of higher concentration to an area of lower concentration

- This is the definition of diffusion — movement down a concentration gradient.
- ✔ Match: b. diffusion

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#### 5. Process by which a cell engulfs materials from outside

- This refers to endocytosis — the cell "eats" or takes in substances by engulfing them into vesicles.
- ✔ Match: d. endocytosis

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#### 6. Movement of particles against a concentration gradient

- This requires energy and is called active transport.
- ✔ Match: c. active transport

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#### 7. Particles move from an area of lower concentration to an area of higher concentration

- This is against the concentration gradient → active transport
- ✔ Match: c. active transport

> Note: Both #6 and #7 refer to active transport, so both should point to c. active transport

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#### 8. Transport process that changes shape when a particle binds with it

- This describes a carrier protein — it changes shape to transport molecules across the membrane (e.g., in facilitated diffusion or active transport).
- ✔ Match: g. carrier protein

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Final Answers:

| Column A | Answer |
|---------|--------|
| 1. Transport protein that provides a cellular opening... | h. channel protein |
| 2. Used during active transport but not passive transport | a. energy |
| 3. Process by which a cell expels waste from a vesicle | e. exocytosis |
| 4. Particle movement from high to low concentration | b. diffusion |
| 5. Process by which a cell engulfs materials | d. endocytosis |
| 6. Movement against concentration gradient | c. active transport |
| 7. Particles move from low to high concentration | c. active transport |
| 8. Transport process that changes shape when a particle binds | g. carrier protein |

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Additional Notes:

- Diffusion is passive and occurs down a gradient.
- Active transport uses energy and moves substances against the gradient.
- Channel proteins allow passive movement through pores.
- Carrier proteins bind to molecules and change shape (can be used in both passive and active transport).
- Exocytosis = out of the cell; Endocytosis = into the cell.

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