ESL Biology Cell Transport Worksheet | Made By Teachers - Free Printable

Let's go through each question on the worksheet step by step and solve them with explanations.

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1. Lipid Movement Across Membrane

Diagram Description:
The diagram shows a phospholipid bilayer with lipids (black circles) on both sides. There are more lipids outside the membrane than inside.

Task:
- Draw an arrow showing the direction the lipids will move.
- Circle all terms that describe this type of transport.

#### ✔ Answer:
- Arrow Direction: From the side with more lipids to the side with fewer lipids (from outside to inside).
- Terms to Circle:
- Passive Transport
- Simple Diffusion

> 🔍 Explanation:
Lipids are nonpolar molecules and can dissolve in the lipid bilayer. They move from an area of high concentration to an area of low concentration without energy input — this is simple diffusion, a form of passive transport.
No protein channels or energy are needed.

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2. Water Movement via Osmosis

Diagram Description:
A cell membrane with water molecules on both sides. The left side has more water molecules, the right side has fewer.

Task:
- Label the side with high water concentration as "MORE", low as "LESS".
- Draw an arrow showing the direction water will flow.
- Circle the correct transport terms.

#### ✔ Answer:
- Labeling:
- Left side: MORE (higher water concentration)
- Right side: LESS (lower water concentration)
- Arrow Direction: From left → right (water moves toward lower water concentration).
- Terms to Circle:
- Passive Transport
- Osmosis

> 🔍 Explanation:
Water moves across a semi-permeable membrane from an area of high water concentration to an area of low water concentration. This process is called osmosis, which is a type of passive transport because it does not require energy.

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3. Multiple Choice Question

Question:
The water molecules will continue to move with this (semi-permeable membrane / concentration gradient) until they reach (diffusion / equilibrium). The cell membrane helps maintain (homeostasis / diffusion).

#### ✔ Answer:
- Correct Answers (circle these):
- concentration gradient
- equilibrium
- homeostasis

> 🔍 Explanation:
Water moves down its concentration gradient until equilibrium is reached (equal concentrations on both sides). The cell maintains a stable internal environment, which is homeostasis.

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4. Ion Transport Using Energy

Diagram Description:
Ions (negative charges) are being moved against their concentration gradient (from low to high concentration), using energy (shown by starburst symbol).

Task:
- Label each side as High or Low ion concentration.
- Draw an arrow showing the direction ions are moving.
- Circle the correct transport terms.

#### ✔ Answer:
- Labeling:
- Left side: LOW (fewer ions)
- Right side: HIGH (more ions)
- Arrow Direction: From left → right (ions moving into the cell against the gradient).
- Terms to Circle:
- Active Transport

> 🔍 Explanation:
Since ions are moving from low to high concentration and energy is used (indicated by the starburst), this is active transport. It requires ATP and uses carrier proteins (like the one shown).
This is not passive, osmosis, or simple/facilitated diffusion — those do not require energy.

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✔ Final Summary of Answers:

| Question | Correct Answers |
|--------|------------------|
| 1 | Arrow: Outside → Inside; Terms: Passive Transport, Simple Diffusion |
| 2 | Left: MORE, Right: LESS; Arrow: Left → Right; Terms: Passive Transport, Osmosis |
| 3 | concentration gradient, equilibrium, homeostasis |
| 4 | Left: LOW, Right: HIGH; Arrow: Left → Right; Term: Active Transport |

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