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Answer :
Final answer:
An alpha helix is a structure found in proteins where the polypeptide chain is coiled and twisted in a right-handed manner. The approximate number of amino acids needed to make an alpha helix that is 10 nm long is around 67 amino acids. The correct answer would be (None of the above).
Explanation:
An alpha helix is a structure found in proteins where the polypeptide chain is coiled and twisted in a right-handed manner. Each turn of the helix spans 3.6 amino acids, and the distance between each turn is 5.4 Å. To approximate the number of amino acids needed to make an alpha helix that is 10 nm long, we can calculate the number of turns required and then multiply by the average number of amino acids per turn.
First, we convert the length of the helix from nanometers to angstroms (1 nm = 10 Å): 10 nm * 10 Å/nm = 100 Å. Next, we divide the length of the helix by the distance between each turn to get the number of turns: 100 Å / 5.4 Å/turn = 18.52 turns. Finally, we multiply the number of turns by the average number of amino acids per turn (3.6): 18.52 turns * 3.6 amino acids/turn ≈ 66.67 amino acids.
Therefore, the approximate number of amino acids needed to make an alpha helix that is 10 nm long is around 67 amino acids. Since none of the given options are close to 67, the correct answer would be (None of the above).
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