True B) African-Americans fought for both the British and American sides during the Revolutionary War. Both sides offered them freedom or money for fighting.
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Answer:
Naturally acquired active, Live, primary, Artificially acquired active, Artificially acquired passive, Antibodies, Naturally acquired passive
Explanation:
Immunity refers to the state of being resistant to infection or reinfection with a pathogen
It can be passive or active immunity.
Active immunity can be Naturally acquired active immunity when a person is exposed to live pathogens,manifests the disease and due to primary immune response they become immune. Artificially acquired active immunity is through vaccination.
Passive immunity can be Naturally acquires passive immunity where a fetus gets some antibodies from maternal blood stream and becomes immune to certain pathogens. Whereas Artificially acquired passive immunity is when an individual is injected with antibodies such as gamma globulin.
Answer: The correct answer is option b.
Explanation:
RNA viruses have RNA as genetic material whereas the host cells usually have DNA as genetic material.
So, in order to integrate its genome with host DNA, the virus must form DNA from RNA, that is, reverse transcription.
It is the process by which DNA is formed using RNA as a template strand.
However, reverse transcriptase (enzyme which catalyzes reverse transcription) is usually not present in host cells.
Thus, RNA viruses carry their own set of enzymes which help in the replication of viral genome and its recombination with host DNA as host cells lack these enzymes.
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