BIOLOGY IN HUMAN WELFARE
HUMAN HEALTH AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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true
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false
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Either A or B
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None of the above
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Detailed explanation-1: -All viruses are obligate pathogens as they are dependent on the cellular machinery of their host for their reproduction.
Detailed explanation-2: -A pathogen is a microorganism capable of causing disease. It infects a multicellular organism and multiplies within it.
Detailed explanation-3: -All true viruses contain nucleic acid-either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)-and protein. The nucleic acid encodes the genetic information unique for each virus. The infective, extracellular (outside the cell) form of a virus is called the virion.
Detailed explanation-4: -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-5: -Nonpathogenic organisms are those that do not cause disease, harm or death to another organism. The term is usually used to describe bacteria. It describes a property of a bacterium – its inability to cause disease. Most bacteria are nonpathogenic.