Biology · Biomolecules · NEET
Collagen. NCERT states plainly: 'Collagen is the most abundant protein in the animal world.' It is a structural protein found in skin, bone, tendons and the space between cells (intercellular ground substance). For NEET, if the question says 'animal', the answer is collagen, NOT RuBisCO.
RuBisCO (Ribulose bisphosphate Carboxylase-Oxygenase). NCERT says RuBisCO 'is the most abundant protein in the whole of the biosphere' and also 'the most abundant enzyme in the world.' The biosphere means all living things on Earth. Because green plants cover the planet and every chloroplast is full of RuBisCO, this one enzyme wins the whole-Earth count.
Both are correct, but for DIFFERENT scopes. Read the question word carefully. 'Most abundant in ANIMALS' = collagen. 'Most abundant in the BIOSPHERE / world / whole Earth' = RuBisCO. NEET sets traps by mixing these two, so the scope word decides the answer.
It is both. All enzymes (except ribozymes) are proteins. RuBisCO is an enzyme of the Calvin cycle that fixes CO2 onto RuBP. Because it is a protein, it can also hold the title 'most abundant protein in the biosphere' and 'most abundant enzyme in the world' at the same time.
Yes. Collagen is the most abundant protein in the human body and in animals in general. It gives strength to skin, bones, cartilage and tendons. NCERT frames it as the most abundant protein in the 'animal world', which includes humans, so treat 'human body' the same as 'animals' here.
RuBisCO = Ribulose bisphosphate Carboxylase-Oxygenase. It is abundant because it is the main CO2-fixing enzyme in the leaves of every green plant on Earth, and plant life is huge in total mass. Its active site can bind both CO2 and O2, which is why its name has both 'carboxylase' and 'oxygenase'.
Which one of the following is the most abundant protein in the animals?
Given below are two statements: Statement I: RuBisCO is the most abundant enzyme in the world. Statement II: Photorespiration does not occur in C4 plants. In the light of the above statements, choose the most appropriate answer.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
RuBisCO (Ribulose bisphosphate Carboxylase-Oxygenase). It is the CO2-fixing enzyme of photosynthesis and is present in huge amounts in all green plants, so it is the most abundant protein in the whole biosphere.
Collagen. It is a structural protein of skin, bone, cartilage and tendons, and NCERT names it the most abundant protein in the animal world and the intercellular ground substance.
Yes. RuBisCO is an enzyme (Calvin cycle) and also a protein, so it holds both titles: 'most abundant enzyme in the world' and 'most abundant protein in the biosphere.'
No. Haemoglobin is important for oxygen transport but is not the most abundant. Collagen is most abundant in animals; RuBisCO is most abundant in the biosphere.
Read the scope word. 'Animal' or 'human body' means collagen. 'Biosphere', 'world', or 'whole Earth' means RuBisCO. The word chooses the answer.
