Identify the INCORRECT statement about the digestive system: MCQ with Answer and Explanation

Explanation:
Lysosomes are membrane-bound vesicles packed with hydrolytic enzymes (proteases, lipases, nucleases) that digest macromolecules, old organelles, and engulfed pathogens. They maintain an acidic pH (about 5.0) for optimal enzyme activity. Peroxisomes detoxify peroxides, mitochondria generate ATP, chloroplasts perform photosynthesis.

Explanation:
Louis Pasteur, a French microbiologist, is famous for several groundbreaking contributions. He developed the process of pasteurization (heating liquids to kill harmful microbes). He also conclusively disproved the theory of spontaneous generation using his famous swan-neck flask experiment, demonstrating that life only arises from pre-existing life (biogenesis). He also developed vaccines for rabies and anthrax.

Explanation:
Pellagra, characterized by dermatitis, diarrhea, dementia (three D's), results from niacin deficiency. Beriberi is due to B₁ deficiency, scurvy to C, rickets to D. Niacin is part of NAD and NADP, essential in redox reactions. Foods rich in niacin include meat, fish, whole grains. Pellagra historically associated with corn-based diets.