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Which one of the following is the most abundant protein in the animals?
Collagen is the primary structural extracellular matrix protein of connective tissue (skin, tendon, bone, cartilage) and is the most abundant protein in the ANIMAL WORLD. RuBisCO is the most abundant protein in the WHOLE BIOSPHERE. Mark Collagen (Option 2) in 5 seconds!
Collagen is a fibrous structural protein consisting of a triple helical tropocollagen unit. It forms the intercellular ground substance and fibrous extracellular matrix of all animal connective tissues (bones, tendons, cartilage, skin).
NCERT states verbatim in the Biomolecules chapter: "Collagen is the most abundant protein in animal world and Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) is the most abundant protein in the whole of the biosphere."
Haemoglobin is an abundant oxygen-carrying conjugated protein restricted to erythrocytes; Lectins (e.g. Concanavalin A) are plant carbohydrate-binding proteins; Insulin is a peptide hormone present in trace endocrine concentrations.
Collagen is unequivocally the most abundant protein in animals.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect; although abundant in red blood cells, haemoglobin is dwarfed by the massive structural mass of collagen distributed throughout all connective tissues.
Factually exact; collagen constitutes 25-35% of total body protein in animals, making it the most abundant animal protein.
Incorrect; lectins are carbohydrate-binding secondary metabolites/proteins found largely in plants, not abundant animal proteins.
Incorrect; insulin is a regulatory hormone present in picomolar/nanomolar concentrations in blood, representing a negligible fraction of total protein mass.
Collagen = Most abundant protein in ANIMALS. RuBisCO = Most abundant protein in BIOSPHERE (Earth).
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