MCQ IN MEDICINE

Detailed explanation-1: -Some of those that do cause disease can only replicate inside the cells of the human body and are called obligate pathogens.

Detailed explanation-2: -Viruses need to enter a living cell (such as a human cell) to be able to reproduce, and once inside they take over all of the cellular machinery and force the cell to make new virus. Viruses cause diseases including the flu, herpes simplex virus, Ebola, Zika and the formidable common cold.

Detailed explanation-3: -Bacteria are microscopic pathogens that reproduce rapidly after entering the body. They can release toxins that damage tissues and cause illness.

Detailed explanation-4: -Obligate pathogens require a host to fulfil their life cycle. All viruses are obligate pathogens as they are dependent on the cellular machinery of their host for their reproduction.

Detailed explanation-5: -How viruses travel through the body. Once a virus gets into a host’s body, it travels along the surfaces of cells until its proteins begin to bind with receptors on the cells. The virus and the cells then fuse, allowing the DNA or RNA inside the virus to enter the cells, where it begins to reproduce.