The pitch of an α-helix is 5.4 Å. The approximate length of the α-helix consisting of 15 amino acids in Å is .............. (decimal digits up to 1 place)
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Correct Answer: 22.4
Solution and Explanation
Step 1: Formula for the length of an α-helix.
The length of an α-helix can be calculated by multiplying the pitch by the number of amino acids in the helix:
\[
\text{Length of α-helix} = \text{pitch} \times \text{number of amino acids}.
\]
Step 2: Apply the formula.
Given that the pitch of the α-helix is 5.4 Å and the number of amino acids is 15, the length is:
\[
\text{Length of α-helix} = 5.4 \, \text{Å} \times 15 = 81.0 \, \text{Å}.
\]
Step 3: Conclusion.
The approximate length of the α-helix consisting of 15 amino acids is 81.0 Å.
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