To visualize the spatial arrangement of amino acid residues in an a-helix, it is helpful to imagine you are looking down the long axis of the helix, just as you would look down a soda straw. Viewed in this orientation, the residues form a circle, with each residue offset from its neighbor by 100 degrees. This representation is called a helical wheel. Use the circle below to indicate the position of each residue around the helix of the enzyme lysozyme. NH Arg - Cys – Glu – Leu – Ala – Ala – Ala – Met - Lys COO- The first two amino acids, Arg-1 and Cys-2, are shown as an example. Arg-1 O Glu-3 Which amino acid in the polypeptide is the first to pass the origin (i.e., which amino acid passes Arg- 1 first, completing one full circle)? Select the best answer. O Leu-4 O Ala-5 00 O Ala-6 O Ala-7 Met-8 100⁰ O Lys-9 O none of the above Cys-2

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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To visualize the spatial arrangement of amino acid residues in an a-helix, it is helpful to imagine you
are looking down the long axis of the helix, just as you would look down a soda straw. Viewed in this
orientation, the residues form a circle, with each residue offset from its neighbor by 100 degrees.
This representation is called a helical wheel.
Use the circle below to indicate the position of each residue around the helix of the enzyme
lysozyme.
NH ...Arg - Cys - Glu- Leu - Ala Ala - Ala Met-Lys COO-
The first two amino acids, Arg-1 and Cys-2, are shown as an example.
Arg-1
O Glu-3
Which amino acid in the polypeptide is the first to pass the origin (i.e., which amino acid passes Arg-
1 first, completing one full circle)? Select the best answer.
O Leu-4
O Ala-5
O Ala-6
O Ala-7
Met-8
O Lys-9
100°
O none of the above
Cys-2
Transcribed Image Text:To visualize the spatial arrangement of amino acid residues in an a-helix, it is helpful to imagine you are looking down the long axis of the helix, just as you would look down a soda straw. Viewed in this orientation, the residues form a circle, with each residue offset from its neighbor by 100 degrees. This representation is called a helical wheel. Use the circle below to indicate the position of each residue around the helix of the enzyme lysozyme. NH ...Arg - Cys - Glu- Leu - Ala Ala - Ala Met-Lys COO- The first two amino acids, Arg-1 and Cys-2, are shown as an example. Arg-1 O Glu-3 Which amino acid in the polypeptide is the first to pass the origin (i.e., which amino acid passes Arg- 1 first, completing one full circle)? Select the best answer. O Leu-4 O Ala-5 O Ala-6 O Ala-7 Met-8 O Lys-9 100° O none of the above Cys-2
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