Question

Amphipathic alpha helices have 2 faces, the _ and the _. Their signature amino acid sequence is:

A. Hydrophilic, hydrophobic; Lysine
B. Hydrophobic, hydrophilic; Leucine
C. Hydrophobic, hydrophilic; Alanine
D. Hydrophilic, hydrophobic; Glycine

Answer 1

Amphipathic alpha helices have a hydrophobic and a hydrophilic face; the signature amino acid sequence is often leucine due to its hydrophobic nature. The option (B) is correct.

Step-by-step explanation:

Amphipathic alpha-helices in proteins have two faces; one is hydrophilic, which interacts with the aqueous environment, and the other is hydrophobic, which interacts with lipid membranes or the protein's hydrophobic core.

The correct answer to the student's question about the amphipathic alpha helices having two faces, the _ and the _, and their signature amino acid sequence is B. Hydrophobic, hydrophilic; Leucine. Leucine is often found in the hydrophobic regions of proteins, including alpha helices that span lipid bilayers or contribute to the core structure of globular proteins.