Plasma Membrane activity - Free Printable

Task: Label parts of the Plasma Membrane and Answer Questions

#### Part I: Labeling the Plasma Membrane
The image provided shows a diagram of the plasma membrane. Below is the explanation for each labeled part, along with the correct terms to fill in the blanks.

1. Top Left (Yellow Box):
- This refers to the Carbohydrate Chain. These are sugar molecules attached to proteins or lipids on the outer surface of the membrane, forming glycoproteins or glycolipids.

2. Middle Left (Blue Structure):
- This is a Protein embedded in the membrane. Proteins can be integral (spanning the entire membrane) or peripheral (attached to the surface).

3. Middle Center (Red and Yellow Structure):
- This represents the Phospholipid Bilayer. The red heads are the Hydrophilic heads, and the yellow tails are the Hydrophobic tails. Phospholipids form the basic structure of the membrane.

4. Bottom Left (Yellow Box):
- This is the Bilayer, which is the double layer of phospholipids that forms the core of the plasma membrane.

5. Middle Right (Blue Structure):
- This is another Protein embedded in the membrane, similar to the one on the left.

6. Top Right (Yellow Box):
- This is the Cholesterol molecule. Cholesterol is embedded within the phospholipid bilayer, helping to maintain membrane fluidity.

7. Bottom Right (Yellow Box):
- This highlights the Hydrophobic tails of the phospholipids, which face inward toward the center of the bilayer.

8. Middle Bottom (Yellow Box):
- This highlights the Hydrophilic heads of the phospholipids, which face outward toward the aqueous environments inside and outside the cell.

#### Correct Labels:
- Top Left: Carbohydrate Chain
- Middle Left: Protein
- Middle Center: Phospholipid Bilayer
- Bottom Left: Bilayer
- Middle Right: Protein
- Top Right: Cholesterol
- Bottom Right: Hydrophobic tails
- Middle Bottom: Hydrophilic heads

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#### Part II: Select the Correct Answer
The questions ask about the functions and nature of the plasma membrane. Here are the answers:

1. Plasma Membrane maintains ____________ in the cell.
- The plasma membrane maintains homeostasis in the cell. Homeostasis refers to the balance and stability of the internal environment by regulating the movement of substances in and out of the cell.

2. Plasma Membrane is ____________ in nature.
- The plasma membrane is selectively permeable in nature. This means it allows certain substances to pass through while blocking others, based on their size, charge, and solubility.

3. Plasma Membrane acts like ____________ of the cell.
- The plasma membrane acts like the gatekeeper of the cell. It controls what enters and exits the cell, ensuring that only necessary substances are allowed in or out.

#### Final Answers:
1. Homeostasis
2. Selectively Permeable
3. Gatekeeper

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Final Summary:

#### Part I: Labels
- Top Left: Carbohydrate Chain
- Middle Left: Protein
- Middle Center: Phospholipid Bilayer
- Bottom Left: Bilayer
- Middle Right: Protein
- Top Right: Cholesterol
- Bottom Right: Hydrophobic tails
- Middle Bottom: Hydrophilic heads

#### Part II: Answers
1. Homeostasis
2. Selectively Permeable
3. Gatekeeper

Final Answer:
\boxed{
\text{Part I: Carbohydrate Chain, Protein, Phospholipid Bilayer, Bilayer, Protein, Cholesterol, Hydrophobic tails, Hydrophilic heads}
}
\boxed{
\text{Part II: 1. Homeostasis, 2. Selectively Permeable, 3. Gatekeeper}
}