Describe in detail the genetic switch to control lytic and lysogenic cycle in lambda bacteriophage. Give the details of Adenovirus or write notes on any four topics such as transmi... Describe in detail the genetic switch to control lytic and lysogenic cycle in lambda bacteriophage. Give the details of Adenovirus or write notes on any four topics such as transmission of plant viruses, ultrastructure of bacteriophage, CaMV, viroids, types of viral envelope and their composition, and prions.
Understand the Problem
The question is asking for details about a general virology exam paper, specifically regarding topics covered in the examination, which may include genetic switches in bacteriophages, genome organization, and multiple-choice questions related to viruses.
Answer
Lambda's switch uses CI for lysogeny and Cro for lytic growth. Adenovirus is non-enveloped, DNA-based.
The genetic switch in lambda bacteriophage involves the CI and Cro proteins. CI promotes lysogeny by repressing lytic genes and activating its own transcription, while Cro promotes lytic growth. Adenoviruses have non-enveloped, icosahedral capsids and double-stranded DNA. They replicate in the nucleus, transcribing early and late genes.
Answer for screen readers
The genetic switch in lambda bacteriophage involves the CI and Cro proteins. CI promotes lysogeny by repressing lytic genes and activating its own transcription, while Cro promotes lytic growth. Adenoviruses have non-enveloped, icosahedral capsids and double-stranded DNA. They replicate in the nucleus, transcribing early and late genes.
More Information
Lambda bacteriophage is a classic model for studying the genetic regulation of viral life cycles. Adenoviruses can cause respiratory illnesses and are used in gene therapy.
Tips
Not understanding the dual role of CI as both repressor and activator can lead to confusion.
Sources
- 21.2B: The Lytic and Lysogenic Cycles of Bacteriophages - bio.libretexts.org
- Bacteriophages (article) | Viruses - Khan Academy - khanacademy.org
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