The Cell Theory, one of the fundamental principles of biology, was proposed by Matthias Schleiden (a German botanist) in 1838 and Theodor Schwann (a British zoologist) in 1839. Schleiden concluded that all plants are composed of cells, and Schwann extended this to animals. Rudolf Virchow later added the third tenet in 1855: 'Omnis cellula e cellula' (all cells arise from pre-existing cells).
Explanation:
Peroxisomes are single-membrane organelles containing oxidative enzymes like catalase and urate oxidase. They break down fatty acids via β-oxidation and detoxify hydrogen peroxide. Lysosomes contain hydrolytic enzymes, mitochondria energy, Golgi packaging. Peroxisomes are abundant in liver and kidney cells.
Explanation:
Luteinizing hormone (LH) triggers ovulation and then promotes the formation and maintenance of the corpus luteum from the ruptured follicle. The corpus luteum secretes progesterone. FSH stimulates follicle growth, prolactin milk production, estrogen from follicles.
Explanation:
Edward Jenner developed the first successful vaccine against smallpox in 1796 using cowpox virus. Pasteur developed rabies vaccine, Koch TB bacterium, Salk polio.
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