#alpha helix

Amino Acids Structure

Which amino acid is least likely to be found in α-helices due to steric hindrance?

Proline is the correct answer as it accurately identifies the biological location, composition, or distribution described in this question. In Amino_Acids_Structure, the spatial organization and localization of molecules are critical to their function. Proline is specifically associated with the structure or compartment mentioned because of its unique biochemical properties and physiological role. The other options (Alanine, Glycine, and Leucine) are primarily associated with different cellular compartments, tissues, or structural contexts.

Ref: Campbell Biology, Urry et al., 12th Ed.

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Ramachandran plot

Which amino acid would most likely disrupt an α-helix?

Proline is the scientifically accurate answer to this question. Within the study of Peptide and Ramachandran plo, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Proline directly address what is being asked. Among the other options, Leucine, Valine, and Tyrosine do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Campbell Biology, Urry et al., 12th Ed.

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Ramachandran plot

The phi (ϕ) and psi (ψ) angles of a right-handed α-helix of L-amino acids are typically:

ϕ Negative, ψ Negative is the scientifically accurate answer to this question. Within the study of Peptide and Ramachandran plo, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of ϕ Negative, ψ Negative directly address what is being asked. Among the other options, ϕ Negative, ψ Positive, ϕ Positive, ψ Negative, and ϕ Positive, ψ Positive do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Campbell Biology, Urry et al., 12th Ed.

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Protein

The α-helix is stabilized by:

Hydrogen bonds between the CO and NH groups of the backbone is the scientifically accurate answer to this question. Within the study of Protein Structure, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Hydrogen bonds between the CO and NH groups of the backbone directly address what is being asked. Among the other options, Hydrophobic interactions, Van der Waals forces, and Electrostatic interactions between R groups do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

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