Which statement about the -helix is true?
A) The hydrophobic interior of -helices is stabilized by the side chains of hydrophobic amino acids.
B) The amino acid side chains point out to the sides with every third amino acid roughly lining up on one side of the helix.
C) -Helices have backbone amide groups that are hydrogen bonded to amino acid side chains.
D) -Helices have 5 amino acids per one turn of the helix.

Question

Which statement about the  -helix is true?
A) The hydrophobic interior of -helices is stabilized by the side chains of hydrophobic amino acids. 
B) The amino acid side chains point out to the sides with every third amino acid roughly lining up on one side of the helix. 
C) -Helices have backbone amide groups that are hydrogen bonded to amino acid side chains. 
D) -Helices have 5 amino acids per one turn of the helix.

Quizplus · Accepted Answer

The statement that every third amino acid roughly lines up on one side of the helix correlates with the pattern of alternating polar and nonpolar amino acids in alpha-helices. The other statements are either incorrect or do not apply to the 11ea8d43_ab6b_b817_b445_5f4b0bf9236a_TB6697_11_TB6697_11-helix specifically.

Which Statement About the -Helix Is True