9. Look at the protein below. Label the diagram on the right and show which part of the protein has hydrophobic amino acid residues and what part of the protein has hydrophilic amino acid residues. Explain how you know.

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**Transcription and Explanation for Educational Website**

**Text:**

9. Look at the protein below. Label the diagram on the right and show which part of the protein has hydrophobic amino acid residues and what part of the protein has hydrophilic amino acid residues. Explain how you know.

**Diagram Explanation:**

The image shows a diagram of a protein interacting with a cell membrane. The diagram illustrates the following components:

- **Cell Membrane:**
  - The membrane is depicted as a double layer of circles with tails, representing the phospholipid bilayer. The circles (heads) are polar (hydrophilic), and the tails are nonpolar (hydrophobic).

- **Protein:**
  - A protein is shown weaving through the membrane, with segments inside and outside the bilayer.
  - The part of the protein embedded within the membrane (across the hydrophobic tails) is typically composed of hydrophobic amino acid residues. This is because the interior of the cell membrane is hydrophobic, favoring the presence of nonpolar residues.
  - The segments of the protein protruding outside the cell membrane are likely to have hydrophilic amino acid residues. These regions interact with the aqueous environment inside and outside the cell.

**Labeling and Explanation:**

- **Hydrophobic Regions:**
  - These are located where the protein segments embed within the membrane, aligning with the tails of the phospholipids. This indicates nonpolar, hydrophobic residues that avoid water.

- **Hydrophilic Regions:**
  - These are the portions of the protein that extend outside the membrane, interacting with the watery environment. These protein parts contain polar, hydrophilic residues that attract water.

The arrow in the diagram indicates the direction or span of the protein across the membrane, emphasizing the distinct regions based on residue interaction characteristics.
Transcribed Image Text:**Transcription and Explanation for Educational Website** **Text:** 9. Look at the protein below. Label the diagram on the right and show which part of the protein has hydrophobic amino acid residues and what part of the protein has hydrophilic amino acid residues. Explain how you know. **Diagram Explanation:** The image shows a diagram of a protein interacting with a cell membrane. The diagram illustrates the following components: - **Cell Membrane:** - The membrane is depicted as a double layer of circles with tails, representing the phospholipid bilayer. The circles (heads) are polar (hydrophilic), and the tails are nonpolar (hydrophobic). - **Protein:** - A protein is shown weaving through the membrane, with segments inside and outside the bilayer. - The part of the protein embedded within the membrane (across the hydrophobic tails) is typically composed of hydrophobic amino acid residues. This is because the interior of the cell membrane is hydrophobic, favoring the presence of nonpolar residues. - The segments of the protein protruding outside the cell membrane are likely to have hydrophilic amino acid residues. These regions interact with the aqueous environment inside and outside the cell. **Labeling and Explanation:** - **Hydrophobic Regions:** - These are located where the protein segments embed within the membrane, aligning with the tails of the phospholipids. This indicates nonpolar, hydrophobic residues that avoid water. - **Hydrophilic Regions:** - These are the portions of the protein that extend outside the membrane, interacting with the watery environment. These protein parts contain polar, hydrophilic residues that attract water. The arrow in the diagram indicates the direction or span of the protein across the membrane, emphasizing the distinct regions based on residue interaction characteristics.
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