MCQ IN MEDICINE

Detailed explanation-1: -Pathogens greatly outnumber nonpathogens. Microorganisms are essential in the feild of genetic engineering. Microorganisms probably appeared on earth about 3.5 million years ago. Pasteurization is a process that kills all microorganisms present in the liquid being pasteurized.

Detailed explanation-2: -A pathogen is a microorganism capable of causing disease. It infects a multicellular organism and multiplies within it.

Detailed explanation-3: -Most bacteria are not pathogenic. Those that are contain specific virulence genes that mediate interactions with the host, eliciting particular responses from the host cells that promote the replication and spread of the pathogen.

Detailed explanation-4: -A pathogen is defined as an organism causing disease to its host, with the severity of the disease symptoms referred to as virulence. Pathogens are taxonomically widely diverse and comprise viruses and bacteria as well as unicellular and multicellular eukaryotes.