Practice question

α-Keratin is composed of α-helices, while β-Keratin consists of β-sheets accurately describes the key difference, similarity, or comparative feature asked about in this question. In Protein, the ability to compare and contrast related concepts is essential for deeper understanding. The distinguishing feature described by α-Keratin is composed of α-helices, while β-Keratin consists of β-sheets reflects fundamental differences in structure, function, mechanism, or origin between the compared entities. The other options (α-Keratin forms β-sheets, β-Keratin contains disulfide bonds, and β-Keratin is present in mammals) either state incorrect comparisons, confuse the properties of the entities being compared, or describe features that are actually shared rather than different.