Alexander Fleming discovered the first antibiotic, Penicillin, from:
A. Streptomyces griseus
B. Escherichia coli
C. Bacillus subtilis
D. Penicillium notatum
Answer: Option D
Solution (By JKExamLibrary)
Alexander Fleming, a Scottish bacteriologist, discovered penicillin in 1928. He returned from a vacation to find that a Petri dish containing Staphylococcus bacteria had been accidentally contaminated by a mold. He noticed a clear zone around the mold where the bacteria had been killed. The mold was identified as Penicillium notatum, and the antibacterial substance was named penicillin.
Explanation:
Vitamin C is a potent water-soluble antioxidant, enhances iron absorption, and supports immune cells. Vitamin A also supports immunity but is not primarily an antioxidant; vitamin E is fat-soluble antioxidant.
Explanation:
Sericulture is the process of rearing silkworms (primarily Bombyx mori) for the production of silk. The silkworm feeds on mulberry leaves (Morus alba) and spins a continuous filament of silk protein (fibroin) to form a cocoon around itself during its pupal stage. The cocoons are then boiled to kill the pupa and unwind the silk filament for textile production.
Explanation:
Binary fission is a type of asexual reproduction in prokaryotes where the cell divides into two identical daughter cells after DNA replication. Mitosis and meiosis are eukaryotic. Budding occurs in yeast and some bacteria.
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