The width of the lipid bilayer membrane is 30 Å. It is permeated by a protein which is a right‐handed α‐helix. Q50 The number of α-helical turns permeating the membrane is A 5.6 turns B 3.5 turns C 6.5 turns D 5.0 turns Q51 The number of amino acid residues present in the protein is A 15 B 18 C 17 D 20

Q50 The number of α-helical turns is 5.6 turns (A) Calculation: 30 Å ÷ 5.4 Å per turn ≈ 5.6 turns. Q51 The number of amino acid residues is 20 (D) Calculation: 5.6 turns × 3.6 residues per turn ≈ 20 residues.

The width of the lipid bilayer membrane is 30 Å. It is permeated by a protein which is a right‐handed α‐helix.

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The width of the lipid bilayer membrane is 30 Å. It is permeated by a protein which is a right‐handed α‐helix.

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The width of the lipid bilayer membrane is 30 Å. It is permeated by a protein which is a right‐handed α‐helix.

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