Which of the following structures prevents the entry of food into the trachea during swallowing?
A. Uvula
B. Epiglottis
C. Glottis
D. Tongue
Answer: Option B
Solution (By JKExamLibrary)
The epiglottis is a cartilaginous flap that covers the glottis (the opening into the larynx and trachea) during swallowing, directing food and liquid into the esophagus. The tongue moves food, the glottis is the opening itself, and the uvula is a soft tissue hanging at the back of the palate that assists in speech and prevents nasal regurgitation.
Explanation:
Hybridoma technology fuses antibody-producing B cells with immortal myeloma cells to create hybridomas that produce monoclonal antibodies. Developed by Kohler and Milstein.
Explanation:
Louis Pasteur developed the first rabies vaccine in 1885, using dried spinal cords from infected rabbits. Jenner developed smallpox vaccine, Koch identified tuberculosis bacterium, Salk developed inactivated polio vaccine.
Explanation:
Louis Pasteur developed the first vaccine against rabies in 1885, using a weakened strain of the virus. He also invented pasteurization and made significant contributions to microbiology, disproving spontaneous generation. Jenner developed smallpox vaccine. Salk developed polio vaccine. BCG for TB was developed later. Pasteur's work laid the groundwork for modern immunology.
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