Which of the following best describes the arrangement of amino acid side chains

Question

Which of the following best describes the arrangement of amino acid side chains in a -pleated sheet composed of several -strands

A.

The side chains point toward the neighboring strands in the sheet.

B.

The side chains point toward the N-terminal end of the strand.

C.

The side chains point toward the C-terminal end of the strand.

D.

There's no particular orientation - it depends on the environmental conditions.

E.

The side chains point away from the strand's axis above and below the plane of the sheet.

Explanation / Answer

C.

The side chains point toward the C-terminal end of the strand.

Beta strands side chains are arranged alternately on opposite sides of the strand and held by hydrogen bonds. The distance between amino acids in a beta strand is 3.5A an dis longer than the alpha strands of 1.5A . beta sheets are more flexible and alpha helices are flat and can be twisted. beta sheets lenght in a protein is 6 A.a . length of beta sheets varies from 2 to 22 residues.

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