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Which one of the following is the most abundant protein in the animals?

1. Collagen
2. Lectin
3. Insulin
4. Haemoglobin

Correct answer: Collagen

Solution

Collagen is the primary structural protein in the extracellular matrix of animals, making up a large fraction of total body protein. It is widespread in connective tissues, so it is more abundant than proteins like hemoglobin, insulin, or lectins.

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