passive transport analysis
name: ____________________
date: ____________________

true or false
put a \ for true or an \f\ for false in the space provided.
if false, cross out certain words or phrases in the statement to make them true.

1. ____ passive transport does not require energy.
2. ____ diffusion is an example of passive transport.
3. ____ sugars pass through the cell membrane without the aid of proteins.
4. ____ osmosis is the transport of ions from high concentrations to low concentrations.
5. ____ only molecules that are entering the cell from the outside can diffuse via passive transport.

fill in
6)
7)
8)
types of passive transport
description and examples

9) in passive cell transport, substances move from ____ concentrations to ____ concentrations.
10) in order for substances to diffuse, a ____ gradient must exist.
11) a concentration gradient is a ____ of concentrations between two regions.
12) ____ proteins or channel proteins are used to aid substances across the cell membrane in passive transport.
13) during passive transport, substances travel ____ the concentration gradient.
14) facilitated diffusion uses ____ to help aid some substances across the cell membrane.
15) cell membranes are ____ ____ because they allow some substances to pass through more easily than others.

Question

passive transport analysis
name: ____________________
date: ____________________

true or false
put a 	\ for true or an \f\ for false in the space provided.
if false, cross out certain words or phrases in the statement to make them true.

1. ____ passive transport does not require energy.
2. ____ diffusion is an example of passive transport.
3. ____ sugars pass through the cell membrane without the aid of proteins.
4. ____ osmosis is the transport of ions from high concentrations to low concentrations.
5. ____ only molecules that are entering the cell from the outside can diffuse via passive transport.

fill in
6)
7)
8)
types of passive transport
description and examples

9) in passive cell transport, substances move from ____ concentrations to ____ concentrations.
10) in order for substances to diffuse, a ____ gradient must exist.
11) a concentration gradient is a ____ of concentrations between two regions.
12) ____ proteins or channel proteins are used to aid substances across the cell membrane in passive transport.
13) during passive transport, substances travel ____ the concentration gradient.
14) facilitated diffusion uses ____ to help aid some substances across the cell membrane.
15) cell membranes are ____ ____ because they allow some substances to pass through more easily than others.

Accepted Answer

### TRUE OR FALSE Section:
1. **Explanation**: Passive transport is defined as the movement of substances across a cell membrane without the use of energy (ATP). So the statement "Passive transport does not require energy" is true.
   Answer: T
2. **Explanation**: Diffusion (e.g., simple diffusion of gases like oxygen) is a type of passive transport (moves down concentration gradient, no energy). So the statement "Diffusion is an example of passive transport" is true.
   Answer: T
3. **Explanation**: Sugars (e.g., glucose) typically need protein channels or carriers (facilitated diffusion) to cross the cell membrane; simple diffusion (no protein aid) is for small, nonpolar molecules. So the statement "Sugars pass through the cell membrane without the aid of proteins" is false (correct by adding "do not" or changing to "with aid of proteins").
   Answer: F (correction: Sugars do not pass through the cell membrane without the aid of proteins)
4. **Explanation**: Osmosis is the diffusion of water (not ions) across a semipermeable membrane from high to low water concentration (or low to high solute concentration). So the statement "Osmosis is the transport of ions from high concentrations to low concentrations" is false (correct by changing "ions" to "water" or redefining osmosis).
   Answer: F (correction: Osmosis is the transport of water from high water concentration to low water concentration)
5. **Explanation**: Passive transport includes movement into or out of the cell (e.g., oxygen diffuses into cells, carbon dioxide out). So the statement "Only molecules that are entering the cell from the outside can diffuse via passive transport" is false (correct by removing "only entering" or adding "or exiting").
   Answer: F (correction: Molecules entering or exiting the cell from the outside/inside can diffuse via passive transport)

### FILL IN Section:
6–8: Types of passive transport are **Simple Diffusion**, **Osmosis**, and **Facilitated Diffusion**.

- **Simple Diffusion**:
  Description: Movement of small, nonpolar molecules (e.g., O₂, CO₂) across the cell membrane from an area of high concentration to low concentration, without protein aid.
  Examples: Diffusion of oxygen into cells, carbon dioxide out of cells; diffusion of lipids across membranes.

- **Osmosis**:
  Description: Diffusion of water molecules across a semipermeable membrane from an area of high water potential (low solute concentration) to low water potential (high solute concentration).
  Examples: Water moving into a plant cell in a hypotonic solution; water moving out of a red blood cell in a hypertonic solution.

- **Facilitated Diffusion**:
  Description: Movement of polar or large molecules (e.g., glucose, ions) across the cell membrane from high to low concentration, using protein channels or carriers (no energy).
  Examples: Glucose transport via GLUT proteins; ion transport via channel proteins (e.g., sodium channels).

9. **Explanation**: Passive transport moves substances from **high** concentration to **low** concentration (down the concentration gradient).
   Answer: high; low

10. **Explanation**: For diffusion (passive transport) to occur, a **concentration** gradient (difference in concentration) must exist.
    Answer: concentration

11. **Explanation**: A concentration gradient is a **difference** in solute concentrations between two regions.
    Answer: difference

12. **Explanation**: In passive transport (specifically facilitated diffusion), **carrier** proteins or channel proteins aid substance movement.
    Answer: Carrier

13. **Explanation**: During passive transport, substances travel **down** the concentration gradient (from high to low concentration).
    Answer: down

14. **Explanation**: Facilitated diffusion uses **protein channels (or carriers)** to help substances (e.g., glucose, ions) cross the cell membrane (since they can’t pass via simple diffusion).
    Answer: protein channels (or carriers)

15. **Explanation**: Cell membranes are **semipermeable (or selectively permeable)** because they allow some substances (small, nonpolar; or via transport proteins) to pass more easily than others (large, polar, charged).
    Answer: semipermeable (or selectively permeable)

### Final Answers (Summarized):
#### TRUE/FALSE:
1. T
2. T
3. F (Sugars do not pass... without aid)
4. F (Osmosis is transport of water...)
5. F (Molecules entering or exiting...)

#### FILL IN (Types of Passive Transport Table):
| Types of Passive Transport | Description | Examples |
|----------------------------|-------------|----------|
| 6) Simple Diffusion | Movement of small, nonpolar molecules from high to low concentration (no protein aid) | O₂ into cells, CO₂ out of cells |
| 7) Osmosis | Diffusion of water across a semipermeable membrane from high to low water concentration | Water into plant cells (hypotonic), water out of RBCs (hypertonic) |
| 8) Facilitated Diffusion | Movement of polar/large molecules from high to low concentration (via protein channels/carriers) | Glucose via GLUT proteins, ions via channel proteins |

#### Fill-in Blanks:
9. high; low
10. concentration
11. difference
12. Carrier
13. down
14. protein channels (or carriers)
15. semipermeable (or selectively permeable)

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