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#fibrous proteins

3 public questions tagged with this topic.

Protein

The major distinguishing feature between α-keratin and β-keratin is:

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.

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

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Protein

Which of the following is NOT a characteristic of fibrous proteins?

Water-soluble is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of Protein, the other options (Structural role, Repeating secondary structure, and Found in extracellular matrix) are all valid and well-established concepts. Water-soluble is either unrelated to the topic, describes a different biological process, or represents a common misconception. Questions framed as 'which is NOT' require students to identify the exception among otherwise correct statements, demanding comprehensive knowledge of the topic rather than recognition of a single fact.

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

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