Cell Membrane Structure - Function Reading Interactive online ... - Free Printable

Let's solve this Cell Membrane Coloring worksheet step by step, identifying each part of the cell membrane, matching structures to their functions, and labeling hydrophilic and hydrophobic regions.

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🔹 Part 1: Identify and Color Code Each Part

We are given a diagram with letters A–I. We need to match each letter to the correct structure and assign colors as specified.

#### 📌 Structure Identification:

- A: Phospholipid bilayer (no color)
- B: Transport protein (pink)
- C: Membrane protein (red)
- D: Cholesterol (blue)
- E: Carbohydrate chain (green)
- F: Fatty acid tails (orange)
- G: Phospholipid head (not explicitly labeled but implied in bilayer)
- H: Channel protein or transport protein (same as B)
- I: Phospholipid tail (fatty acid tails)

Wait — let’s carefully analyze the diagram:

Looking at standard cell membrane diagrams:

- The phospholipid bilayer is made of two layers of phospholipids.
- Phospholipid heads are hydrophilic, facing outward toward water.
- Fatty acid tails are hydrophobic, pointing inward.
- Proteins embedded in the membrane include:
- Transport proteins (spanning the membrane, helping move substances).
- Membrane proteins (can be peripheral or integral).
- Cholesterol molecules are embedded in the bilayer.
- Carbohydrate chains are attached to proteins or lipids on the extracellular side.

Now, from the diagram:

- A: Entire bilayer → Phospholipid bilayer
- B: Large protein spanning the membrane → Transport protein
- C: Protein extending into the extracellular space → Membrane protein
- D: Small molecule between phospholipids → Cholesterol
- E: Chains sticking out from surface → Carbohydrate chain
- F: Tails of phospholipids (inside the bilayer) → Fatty acid tails
- G: Heads of phospholipids (outer layer) → Phospholipid heads
- H: Another protein spanning membrane → Transport protein (likely same as B)
- I: Tail region → Fatty acid tails

But we have only one blank per name.

Let’s match based on typical labels:

| Letter | Structure |
|--------|-----------|
| A | Phospholipid bilayer |
| B | Transport protein |
| C | Membrane protein |
| D | Cholesterol |
| E | Carbohydrate chain |
| F | Fatty acid tails |
| G | Phospholipid heads (but not listed) |
| H | Transport protein (another one) |
| I | Fatty acid tails |

So:

- Phospholipid bilayer (no color) → A
- Transport protein (pink) → B or H (both are transport proteins; likely B is primary)
- Fatty acid tails (orange) → F or I (both point to tails; probably F and I)
- Membrane protein (red) → C
- Cholesterol (blue) → D
- Carbohydrate chain (green) → E

So fill in the table:

| Letter | Name/Color |
|--------|--------------------------|
| A | Phospholipid bilayer (no color) |
| B | Transport protein (pink) |
| F | Fatty acid tails (orange) |
| C | Membrane protein (red) |
| D | Cholesterol (blue) |
| E | Carbohydrate chain (green) |

Note: I also points to fatty acid tails, so it could be F or I. But since both F and I are shown pointing to tails, and only one slot for "fatty acid tails", pick F as representative.

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🔹 Part 2: Label Hydrophilic and Hydrophobic Parts

In the lower diagram of the phospholipid bilayer:

- Blue spheres = Phospholipid heads → Hydrophilic (attract water)
- Wavy lines = Fatty acid tails → Hydrophobic (repel water)

So:

- Top box (pointing to blue spheres): Hydrophilic
- Bottom box (pointing to wavy lines): Hydrophobic

✔ Answer:
- Upper box: Hydrophilic
- Lower box: Hydrophobic

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🔹 Part 3: Match Functions to Letters

Now match the function to the correct letter(s):

1. Attracts water → Hydrophilic parts → Phospholipid heads → G (if G is heads)
But G is not labeled directly. However, phospholipid heads are the ones that attract water.

In the diagram, A includes the entire bilayer, but the heads are at the edges.

Looking back: G points to the phospholipid heads → So G attracts water.

✔ G → Attracts water

2. Repels water → Hydrophobic parts → Fatty acid tails → F or I
Both F and I point to tails → Use F or I
✔ F or I → Repels water

3. Helps maintain flexibility of membrane → Cholesterol → D
✔ D → Helps maintain flexibility

4. Makes up the bilayer (2 answers) → Phospholipids → A (entire bilayer), and F/I (tails), G (heads)
But the question says “2 answers” — likely A and F or G?

Actually, the phospholipid bilayer is made of phospholipid heads and tails → G and F (or I)

But A is the whole bilayer — so A is the answer, but it's made of G (heads) and F (tails)

So “makes up the bilayer” → G and F (or G and I)

Since G is heads and F is tails → ✔ G and F

5. Involved in cell-to-cell recognition → Carbohydrate chains → E
✔ E

6. Helps transport materials (such as glucose) → Transport proteins → B or H
✔ B (or H — both are transport proteins)

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✔ Final Answers:

#### 🔷 Color Coding Table

| Letter | Name/Color |
|--------|----------------------------------|
| A | Phospholipid bilayer (no color) |
| B | Transport protein (pink) |
| F | Fatty acid tails (orange) |
| C | Membrane protein (red) |
| D | Cholesterol (blue) |
| E | Carbohydrate chain (green) |

> Note: If you're coloring, make sure:
> - B and H are pink (transport proteins)
> - C is red (membrane protein)
> - D is blue (cholesterol)
> - E is green (carbohydrate chain)
> - F and I are orange (fatty acid tails)
> - A is left uncolored
> - G is phospholipid heads (not colored)

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#### 🔷 Label Hydrophilic/Hydrophobic

- Top box (phospholipid heads): Hydrophilic
- Bottom box (fatty acid tails): Hydrophobic

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#### 🔷 Match Functions to Letters

| Function | Letter(s) |
|---------|-----------|
| Attracts water | G |
| Repels water | F or I |
| Helps maintain flexibility of membrane | D |
| Makes up the bilayer (2 answers) | G and F |
| Involved in cell-to-cell recognition | E |
| Helps transport materials (such as glucose) | B or H |

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🧠 Summary of Key Concepts:

- Phospholipid bilayer: Double layer with hydrophilic heads outside and hydrophobic tails inside.
- Transport proteins: Help move substances across membrane (e.g., glucose).
- Membrane proteins: Can be structural, enzymatic, or signaling.
- Cholesterol: Stabilizes membrane and prevents it from being too rigid or fluid.
- Carbohydrate chains: Attached to proteins/lipids on outside → help in cell recognition.

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✔ Final Answer Sheet:

#### Color Code Table:
- A – Phospholipid bilayer (no color)
- B – Transport protein (pink)
- F – Fatty acid tails (orange)
- C – Membrane protein (red)
- D – Cholesterol (blue)
- E – Carbohydrate chain (green)

#### Hydrophilic/Hydrophobic:
- Top: Hydrophilic
- Bottom: Hydrophobic

#### Matching:
1. Attracts water → G
2. Repels water → F or I
3. Helps maintain flexibility → D
4. Makes up the bilayer → G and F
5. Involved in cell-to-cell recognition → E
6. Helps transport materials → B or H

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