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Questions and Answers
What was the outcome of Wendell Stanley's experiment in 1935?
What was the outcome of Wendell Stanley's experiment in 1935?
- He discovered the first virus.
- He developed a cure for tobacco mosaic disease.
- He discovered the bacteriophage.
- He crystallized the infectious particle, now known as tobacco mosaic virus (TMV). (correct)
What is the term for viruses that can replicate only within a host cell?
What is the term for viruses that can replicate only within a host cell?
- Host-dependent parasites.
- Obligate intracellular parasites. (correct)
- Facultative extracellular parasites.
- Optional obligate parasites.
What is the function of the tail fibers in a bacteriophage?
What is the function of the tail fibers in a bacteriophage?
- To synthesize viral proteins.
- To assemble new viruses.
- To attach to the host cell. (correct)
- To release the viral genome.
What is the term for a phage that reproduces only by the lytic cycle?
What is the term for a phage that reproduces only by the lytic cycle?
What is the term for the integrated viral DNA molecule in the lysogenic cycle?
What is the term for the integrated viral DNA molecule in the lysogenic cycle?
What triggers the virus genome to exit the bacterial chromosome and switch to the lytic mode in a temperate phage?
What triggers the virus genome to exit the bacterial chromosome and switch to the lytic mode in a temperate phage?
What is the outcome when a prophage exits the bacterial chromosome?
What is the outcome when a prophage exits the bacterial chromosome?
What is the purpose of viral envelopes?
What is the purpose of viral envelopes?
What is the function of reverse transcriptase in retroviruses?
What is the function of reverse transcriptase in retroviruses?
Why are vaccines effective against viral infections?
Why are vaccines effective against viral infections?
What is the main difference between viral diseases in plants and animals?
What is the main difference between viral diseases in plants and animals?
What is the function of plasmodesmata in plants?
What is the function of plasmodesmata in plants?
What is the difference between viroids and prions?
What is the difference between viroids and prions?
What is the outcome when a virus infects a host cell?
What is the outcome when a virus infects a host cell?
Why do emerging viruses suddenly become apparent?
Why do emerging viruses suddenly become apparent?
What is the economic impact of plant viral diseases?
What is the economic impact of plant viral diseases?
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