Question
The correct statement in respect of protein haemoglobin is that it:
Maintains blood sugar level
Acts as an oxygen carrier in the blood
Forms antibodies and offers resistance to diseases
Functions as a catalyst for biological reactions
According to the sources, haemoglobin is a red-coloured, iron-containing complex protein found in erythrocytes (RBCs) . Its primary physiological role is to act as an oxygen carrier, binding reversibly with oxygen to form oxyhaemoglobin . Each haemoglobin molecule can transport a maximum of four molecules of O2, picking them up at the lung surface and dissociating at the tissues . Structurally, it represents a quaternary protein architecture composed of four subunits: two of the \alpha type and two of the \beta type . Other options are incorrect because globulins are involved in defence mechanisms, and hormones like insulin regulate blood sugar levels . Mastering these fundamental protein functions is a high-priority strategy, as NCERT textbooks serve as the definitive source for approximately 95% of NEET Biology questions .
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Body Fluids and Circulation. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
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