Question22 Which one of the following statements describes a typical characteristic of fibrous proteins and includes an example? Select one alternative: Fibrous proteins are long, rod-like, and often insoluble, such as collagen. Fibrous proteins are flexible and globular, like myoglobin. Fibrous proteins are compact and soluble, such as haemoglobin. Fibrous proteins have complex tertiary structures and include enzymes like lysozyme. ResetMaximum marks: 1 Flag question undefined

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BlackTom AI · Accepted Answer

In this question, we are asked to identify a statement that describes a typical characteristic of fibrous proteins and includes an example.
Option 1: 'Fibrous proteins are long, rod-like, and often insoluble, such as collagen.' This aligns well with the canonical description of fibrous proteins: they are elongated, structural proteins that impart support and strength, and many are insoluble in water; collagen is a classic example of a fibrous protein found in connective tissues.
Option 2: 'Fibrous proteins are flexible and globular, like myoglobin.' This is inaccurate because fibrous proteins are typically rigid and insoluble, whereas globular proteins (like myoglobin) are compact, ball-shaped, and generally water-soluble.
Option 3: 'Fibrous proteins are compact and soluble, such as haemoglobin.' Haemoglobin is a globular protein, not fibrous. It is soluble in water and has a compact, folded structure, which contradicts the typical fibrous protein characteristics.
Option 4: 'Fibrous proteins have complex tertiary structures and include enzymes like lysozyme.' While some proteins do have complex tertiary structures, fibrous proteins generally lack the rich, globular tertiary structure seen in enzymes; they tend to have simple, repetitive secondary structures (like alpha-helix or beta-sheet ribbons) that form fibrous assemblies. Lysozyme is a well-known globular enzyme, not a fibrous protein.
Thus, evaluating the statements against the defining features of fibrous proteins—long, rod-like morphology and often insolubility with collagen as a representative example—leads to option 1 as the accurate description.

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