Viruses are considered non-living because they can crystallize. Unlike living organisms, viruses are not cellular and can exist in a crystalline form outside of host cells, remaining inert until they infect a host to reproduce.
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The virus grows in living cells. Viruses require a host cell to replicate and carry out their life cycle. Once inside the cell, they use the host’s machinery to reproduce and spread to new cells.
Edward Jenner discovered the smallpox vaccine. In 1796, he used material from cowpox sores to immunize a young boy against smallpox, demonstrating the efficacy of the first successful vaccine in history.
The vaccine for smallpox was developed by Edward Jenner. In 1796, Jenner used cowpox material to create immunity against smallpox, marking the first successful vaccine. This groundbreaking work laid the foundation for modern immunology.
The virus which causes hydrophobia due to dog bite is called rabies. Rabies is a viral infection transmitted through the saliva of infected animals, most commonly dogs, and affects the nervous system.
Hydrophobia, also known as rabies, is caused by viruses. Specifically, the rabies virus affects the nervous system, leading to symptoms such as fear of water and aggression. The virus is transmitted through the saliva of infected animals.
Refrigeration helps in food preservation by reducing the rate of biochemical reactions. It slows down the growth of bacteria and other microorganisms, thereby extending the shelf life of food and maintaining its quality.
Azotobacter is the free-living bacteria that increases the yield of paddy in the soil. It fixes atmospheric nitrogen into forms that are accessible to plants, thereby enhancing soil fertility and supporting crop growth.
Tuberculosis is caused by bacteria. Specifically, the bacterium Mycobacterium tuberculosis is responsible for the disease, which primarily affects the lungs but can also impact other parts of the body.
Leghemoglobin functions in nitrogen fixation by absorbing oxygen. It creates a low-oxygen environment in the root nodules, which is necessary for the nitrogen-fixing enzyme nitrogenase to function effectively and fix atmospheric nitrogen.