Multiple Choice
The phage reproductive cycle that kills the bacterial host cell is a __________ cycle, and a phage that always reproduces this way is a __________ phage.
17. Viruses
Viruses
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A new pathogenic form of influenza A can emerge when __________.
A
a mutation occurs in a virus as it passes from one host to another
B
a virus with a novel genetic makeup recombines with viruses that circulate widely among humans
C
there is a concurrent infection of a pig or bird by two or more different strains of influenza A
D
the genomes of two or more influenza A strains mix and match during viral assembly within a host
E
All of the listed responses are correct.
Verified step by step guidance1
Understand that influenza A is a virus that can change its genetic makeup through various mechanisms, leading to new pathogenic forms.
Recognize that mutations can occur in the viral genome as it replicates, especially when it passes from one host to another, potentially leading to new strains.
Consider that recombination can happen when a virus with a novel genetic makeup mixes with other viruses that are already circulating among humans, creating new combinations.
Acknowledge that concurrent infections in animals like pigs or birds by different strains of influenza A can lead to reassortment, where segments of the viral genome are exchanged, producing new viral strains.
Realize that during viral assembly within a host, the mixing and matching of genomes from different strains can result in a new pathogenic form of the virus. All these mechanisms contribute to the emergence of new influenza A forms.
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