Proteins fold into complex three-dimensional shapes. The function is dependent upon the structure of the protein and its cellular location. The final shape of the protein is based on the identity of the amino acid side chains of the protein. Many membrane proteins have significant portions of the molecule that span the phospholipid bilayer of the cell membranes. What type of amino acids would you expect to find in the transmembrane segments? A) nonpolar B) polar neutral C) polar acidic D) polar basic E) any of the polar side chains

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### Understanding Protein Structure and Function

Proteins fold into complex three-dimensional shapes. The function of a protein is dependent upon its structure and cellular location. The final shape of a protein is based on the identity of the amino acid side chains of the protein.

Many membrane proteins have significant portions of the molecule that span the phospholipid bilayer of the cell membranes.

**Question:** What type of amino acids would you expect to find in the transmembrane segments?

**Options:**
- A) Nonpolar
- B) Polar neutral
- C) Polar acidic
- D) Polar basic
- E) Any of the polar side chains

**Explanation:**
Typically, transmembrane segments of membrane proteins interact with the hydrophobic core of the phospholipid bilayer. Therefore, you would expect to predominantly find nonpolar amino acids in these segments. Nonpolar side chains are hydrophobic and interact favorably with the interior of the lipid bilayer, helping to stabilize the protein's structure within the membrane.

Understanding the nature of these amino acids and their interactions within the cell membrane is crucial for comprehending how proteins function in various cellular processes, including signal transduction, transport, and cellular communication.
Transcribed Image Text:### Understanding Protein Structure and Function Proteins fold into complex three-dimensional shapes. The function of a protein is dependent upon its structure and cellular location. The final shape of a protein is based on the identity of the amino acid side chains of the protein. Many membrane proteins have significant portions of the molecule that span the phospholipid bilayer of the cell membranes. **Question:** What type of amino acids would you expect to find in the transmembrane segments? **Options:** - A) Nonpolar - B) Polar neutral - C) Polar acidic - D) Polar basic - E) Any of the polar side chains **Explanation:** Typically, transmembrane segments of membrane proteins interact with the hydrophobic core of the phospholipid bilayer. Therefore, you would expect to predominantly find nonpolar amino acids in these segments. Nonpolar side chains are hydrophobic and interact favorably with the interior of the lipid bilayer, helping to stabilize the protein's structure within the membrane. Understanding the nature of these amino acids and their interactions within the cell membrane is crucial for comprehending how proteins function in various cellular processes, including signal transduction, transport, and cellular communication.
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