The 'Humulin' was the first genetically engineered human therapeutic product approved for clinical use. It is: MCQ with Answer and Explanation

Explanation:
Edward Jenner is considered the father of immunology for pioneering the concept of vaccination by developing the smallpox vaccine. Alexander Fleming discovered the first antibiotic, penicillin, from the fungus Penicillium notatum in 1928. Louis Pasteur made monumental contributions to microbiology and vaccination, but the structure of DNA was discovered by James Watson and Francis Crick in 1953. Thus, statements 1 and 2 are correct.

Explanation:
Vitamin B₁₂ (cobalamin) is required for DNA synthesis and RBC maturation. Deficiency causes pernicious anemia. It also maintains myelin sheath.

Explanation:
Fungi (and bacteria) are decomposers that break down dead organic matter and waste, releasing nutrients back into the ecosystem. They are saprotrophs. Grass is a producer, lion and eagle are consumers (carnivores). Decomposers are essential for nutrient cycling, especially carbon and nitrogen cycles. Without decomposers, ecosystems would be clogged with dead material.