This completed worksheet outlines four key functions of the plasma membrane and includes a diagram where structures like integral proteins and cholesterol are color-coded.

Let's solve this step by step based on the image and the instructions provided.

---

Part 1: List 4 Functions of the Cell or Plasma Membrane

The four functions are already listed in the image. Let's review and clarify them:

a. Help maintain homeostasis
→ The plasma membrane regulates what enters and exits the cell, helping to keep the internal environment stable.

b. Exchange materials like food, water, and wastes
→ It allows essential substances (nutrients, water) to enter and waste products (like CO₂) to exit the cell.

c. Water, oxygen, CO₂ can move freely
→ These small, nonpolar molecules can diffuse directly through the lipid bilayer without assistance.

d. It is semipermeable or selectively permeable allowing certain molecules to pass through
→ This means only specific substances can cross the membrane, either by diffusion or with the help of transport proteins.

✔ All four functions are correctly stated.

---

Part 2: Identify and Color-Code Each Part of the Cell Membrane

We are given a diagram with labeled parts (A, B, C, E, F, G, I), and we need to match each letter to the correct structure and color.

Let’s go through each one:

#### Given Key:
| Letter | Name / Color |
|--------|--------------|
| a | Phospholipid bilayer (no color) |
| b | Integral protein (pink) |
| f | Fatty acid tails (orange) |
| g | Phosphate heads (yellow) |
| c | Peripheral protein (red) |
| i | Cholesterol (blue) |
| h | Glycoprotein (green) |
| e | Glycolipids (purple) |

Now let’s identify which letter corresponds to which part in the diagram.

---

#### Analyzing the Diagram:

- A: This is the entire phospholipid bilayer → So A = a
→ No color needed (phospholipid bilayer itself is not colored in this diagram).

- B: The pink structure going through the membrane → Integral protein → B = b

- C: The red structure attached to the surface (not embedded) → Peripheral protein → C = c

- E: The purple structures with sugar chains on the outside → Glycolipids → E = e

- F: The orange regions (tails of phospholipids) → Fatty acid tails → F = f

- G: The yellow spheres at the ends of the phospholipids → Phosphate heads → G = g

- I: The blue structures within the bilayer → Cholesterol → I = i

- H: The green structure with a sugar chain → Glycoprotein → H = h

Wait — but in the diagram, there is no label H visible. However, the green structure is present and labeled as H in the key. Looking closely:

- There is a green oval with a sugar chain attached → That must be H, even if not labeled in the diagram.

But the diagram shows:
- A green structure → likely H (Glycoprotein)
- A purple structure → E (Glycolipids)

So let's map all letters:

---

✔ Final Matching:

| Letter | Structure | Color | Matches Key? |
|--------|-----------------------|-------------|--------------|
| A | Phospholipid bilayer | No color | ✔️ a |
| B | Integral protein | Pink | ✔️ b |
| C | Peripheral protein | Red | ✔️ c |
| E | Glycolipids | Purple | ✔️ e |
| F | Fatty acid tails | Orange | ✔️ f |
| G | Phosphate heads | Yellow | ✔️ g |
| I | Cholesterol | Blue | ✔️ i |
| H | Glycoprotein | Green | ✔️ h |

> Note: In the diagram, H is not explicitly labeled, but the green structure with sugar chain should be labeled H.

---

✔ Correct Answer Table:

| Letter | Name/Color |
|--------|--------------------------------|
| a | Phospholipid bilayer (no color) → A |
| b | Integral protein (pink) → B |
| f | Fatty acid tails (orange) → F |
| g | Phosphate heads (yellow) → G |
| c | Peripheral protein (red) → C |
| i | Cholesterol (blue) → I |
| h | Glycoprotein (green) → H |
| e | Glycolipids (purple) → E |

---

🔍 Summary of Answers:

#### Functions of the Plasma Membrane:
1. Helps maintain homeostasis
2. Exchanges materials like food, water, and wastes
3. Allows free movement of water, oxygen, and CO₂
4. Is selectively permeable

#### Labeling & Color Coding:

| Letter | Component | Color |
|--------|------------------------|-------------|
| A | Phospholipid bilayer | No color |
| B | Integral protein | Pink |
| C | Peripheral protein | Red |
| E | Glycolipids | Purple |
| F | Fatty acid tails | Orange |
| G | Phosphate heads | Yellow |
| I | Cholesterol | Blue |
| H | Glycoprotein | Green |

> 💡 Tip: When coloring, make sure:
> - Pink for integral proteins (spans the membrane)
> - Red for peripheral proteins (attached to surface)
> - Blue for cholesterol (embedded in bilayer)
> - Green for glycoproteins (protein + sugar)
> - Purple for glycolipids (lipid + sugar)
> - Orange for fatty acid tails (hydrophobic interior)
> - Yellow for phosphate heads (hydrophilic exterior)

---

✔ All tasks completed! You’ve now identified the functions and correctly matched the components of the cell membrane.