The organ that stores urine before excretion is the: MCQ with Answer and Explanation

Explanation:
The Operon model, specifically the lac operon model, was proposed by French scientists François Jacob and Jacques Monod in 1961 to explain the regulation of gene expression in prokaryotes (bacteria). They proposed that genes are organized into functional units called operons, consisting of a promoter, an operator, and structural genes, controlled by a regulatory gene. They were awarded the Nobel Prize in Physiology or Medicine in 1965 for this discovery. Beadle and Tatum proposed the 'one gene-one enzyme' hypothesis.

Explanation:
Clostridium botulinum, an anaerobic spore-forming bacterium, produces a potent neurotoxin causing botulism, often from improperly canned low-acid foods. Salmonella and E. coli cause gastroenteritis from contaminated food/water, Staphylococcus aureus produces enterotoxins causing acute vomiting. Botulism can be fatal without antitoxin.

Explanation:
Lymphatic filariasis, commonly known as elephantiasis, is a parasitic disease caused by nematode worms, primarily Wuchereria bancrofti. The infective larvae (microfilariae) are transmitted to humans through the bite of an infected female Culex mosquito (primarily Culex pipiens fatigans). The adult worms lodge in the lymphatic vessels, causing severe inflammation, blockage, and the characteristic massive swelling (elephantiasis) of the limbs and genitals. Anopheles transmits malaria, Aedes transmits dengue.