Question

Which of the following statements is not typical of an alpha-helical secondary structure in proteins?

Group of answer choices

Hydrogen bonds are parallel to the axis of the helix.

When looking down the axis of the helix, the polypeptide chain turns in a clockwise direction.

The alpha-helix can be amphipathic or composed mostly of polar or nonpolar residues.

The N-H groups involved in hydrogen bonding are oriented in a direction opposite to the carbonyl groups.

The R groups of the amino acids point toward the center of the helix.

Answer 1

Answer) The fifth statment - The R groups of the amino acids point toward the center of the helix is not a typical of an alpha-helical secondary structure in protein.
Because in the geometry of Alpha helix secondary structure, the side chains or the R group of amino acids points outward from the helix and not in the centre of the helix. They are towards it's amino-terminal end.

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