Indicate which one of the following statements about nucleic acids and protein structures is correct. * 1 point A)A β-turn is formed by four amino acids. The type of β-turn is determined by the dihedral angles of the second and third amino acid. B)The backbone dihedral angles of α-helices and β-sheets are very similar. Only the hydrogen bonding pattern is different. C)Hydrogen bonding between the bases in the major and minor grooves of DNA is absent. D)Both uracil and thymine have a methyl group but at different positions.
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The β-turn is the third most important secondary structure after helices and β-strands. β-turns have been classified according to the values of the dihedral angles φ and ψ of the central residue.
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