This worksheet helps students visualize the fluid mosaic model by coloring and labeling key structures like transport proteins and carbohydrate chains.

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

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🔹 Part 1: Identify and Color Code Each Part

We are given a diagram with letters A–I. Let’s identify each:

| Letter | Structure / Name | Color |
|--------|------------------|-------|
| A | Phospholipid bilayer (entire layer) | No color (leave uncolored or outline) |
| B | Transport protein (spanning the membrane) | Pink |
| C | Membrane protein (embedded, possibly receptor or enzyme) | Red |
| E | Carbohydrate chain (attached to proteins/glycoproteins) | Green |
| F | Cholesterol molecule (in the lipid bilayer) | Blue |
| G | Fatty acid tails (hydrophobic tails inside the bilayer) | Orange |
| H | Another transport protein (possibly channel or carrier) | Pink |
| I | Phospholipid heads (hydrophilic heads facing outward) | Not colored (but note: these are hydrophilic) |

> Note: The phospholipid bilayer is made up of two layers of phospholipids — each has a head (hydrophilic) and tails (hydrophobic).

So let’s assign:
- Phospholipid bilayer (no color) → A
- Transport protein (pink) → B and H
- Fatty acid tails (orange) → G
- Membrane protein (red) → C
- Cholesterol (blue) → F
- Carbohydrate chain (green) → E

✔ So fill in the table:

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

> ✔ Note: Both B and H are transport proteins (spanning the membrane), so both should be pink.

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🔹 Part 2: Label Hydrophilic and Hydrophobic Parts of Phospholipids

Below the main diagram is a simplified phospholipid bilayer.

- The spherical heads (top and bottom) are hydrophilic (attract water).
- The wavy tails (middle) are hydrophobic (repel water).

Label accordingly:

```
[Top] → Hydrophilic (attracts water)
[Bottom] → Hydrophobic (repels water)
```

But in the diagram, you have two boxes:

- The top box (pointing to the round heads): Hydrophilic
- The bottom box (pointing to the wavy tails): Hydrophobic

✔ So write:
- Top box: Hydrophilic
- Bottom box: Hydrophobic

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🔹 Part 3: Match Functions to Letters

Now match the functions with the correct letter(s):

| Function | Correct Letter(s) | Explanation |
|--------|-------------------|-----------|
| Attracts water | I | The phospholipid heads (I) are hydrophilic and attract water. |
| Repels water | G | The fatty acid tails (G) are hydrophobic and repel water. |
| Helps maintain flexibility of membrane | F | Cholesterol (F) helps stabilize and maintain fluidity/flexibility. |
| Makes up the bilayer (2 answers) | A and G | The bilayer (A) is composed of phospholipids; G = fatty acid tails (part of it). But technically, A represents the entire bilayer. Since the question asks for two answers, likely: A and G? Wait — better interpretation: the phospholipids make up the bilayer, but we don't have a single label for "phospholipid" — however, A is the bilayer, and G is the tail portion. But actually, A is the whole structure. So maybe: A (bilayer) and G (fatty acid tails) — but that's not quite right. Let's reconsider.

Wait — the phospholipid molecules make up the bilayer. But in the diagram, A is labeled as the phospholipid bilayer, so A is the structure made up of phospholipids. But there is no separate label for individual phospholipids.

Alternatively, perhaps A and G together represent the components. But G is only the tails.

Better answer: The phospholipid bilayer (A) is made up of phospholipids, and the fatty acid tails (G) are part of them.

But the best way: The phospholipid bilayer (A) is made up of phospholipids, which include the heads and tails. Since G is the fatty acid tails, and A is the full structure, then A is the bilayer, and G is part of it.

But the question says: “Makes up the bilayer (2 answers)” — so likely referring to the components: phospholipid heads and tails.

But we don’t have a label for the heads. However, G is the tails, and I points to the phospholipid heads.

So:
- I = phospholipid heads
- G = fatty acid tails

Together, they make up the phospholipids → which make up the bilayer.

So: G and I make up the phospholipids → thus make up the bilayer.

But wait — A is the bilayer itself. So perhaps:

- A = bilayer
- G and I = parts of the phospholipids

So if the question wants what makes up the bilayer, the answer is the phospholipids, represented by G and I.

✔ So: G and I

But let’s double-check: Is I labeled correctly?

Looking at the diagram:
- I points to the phospholipid heads (the round spheres on the outer edges).
- G points to the fatty acid tails (the wavy lines inside).

Yes.

So G and I are the two parts of the phospholipid that make up the bilayer.

✔ So: G and I

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

> ✔ Final Matching:

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

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✔ Summary of Answers

#### Color Coding Table:

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

#### Hydrophilic/Hydrophobic Labels:

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

#### Matching Functions:

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

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🎨 How to Color the Diagram:

- Leave A (bilayer) uncolored.
- Color B and H pink (transport proteins).
- Color C red (membrane protein).
- Color E green (carbohydrate chains).
- Color F blue (cholesterol).
- Color G orange (fatty acid tails).

And label the small diagram:
- Top: Hydrophilic
- Bottom: Hydrophobic

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Let me know if you'd like a printable version or a visual guide!