Answer: two light and two heavy chains.
- A two light and two heavy chains
- B four heavy chains only
- C two light chains only
- D three heavy and one light chain
Correct answer: A. two light and two heavy chains
Explanation: Each antibody is represented as H<sub>2</sub>L<sub>2</sub>, with two identical heavy chains and two identical light chains held together to form a Y-shaped molecule.
The Plasmodium parasite needs both hosts: the female Anopheles mosquito injects sporozoites while biting (infecting the human liver and RBCs, causing the malaria fever cycle), then picks up gametocytes from an infected person's blood, completing the parasite's sexual stage inside the mosquito.
Concept context
Pathogens, infectious diseases, non-infectious diseases, drugs, cancer, and public health. High NEET importance.