The following answers are incorrect: 4)a 6)a 7)b 8)d 4. When phage enters the ly
ID: 196683 • Letter: T
Question
The following answers are incorrect:
4)a
6)a
7)b
8)d
4. When phage enters the lytic cycle: A. many new copies of the phage genetic material and coat proteins are assembled to make new phages. The host cell is lysed B. many new copies of the phage genetic material and coat proteins are assembled to make new phages. The host cell remains intact. C. the genetic material of the phage is integrated into the chromosome of the bacterium. D. it immediately lyses the host cells without producing any new viruses.Explanation / Answer
1. When phage lambda enters the lytic cycle, the phage genome is replicated. Synthesis of phage proteins occurs and the phage particles are assembled. The host cell remains intact until the phage proteins lyse the host cell. So, the correct option is option B, new copies of the phage genetic material and the coat proteins are assembled to make new phages. The host cell remains intact.
2. Retroviruses are RNA containing viruses. When a retrovirus infects a host cell, the reverse transcriptase enzyme synthesized by the retrovirus converts the RNA of the virus to DNA. The newly formed retroviral DNA now gets integrated into the host genome. So, the correct option is option C, RNA to DNA.
3. Azidothymidine is a reverse transcriptase enzyme inhibitor. The drug prevents the formation of DNA from RNA that is catalysed by the reverse transcriptase enzyme. Formation of DNA from RNA is required for the integration of viral genetic material into the host genome. Integration into the host genome is required for the replication of viral genetic material and for the formation of viral proteins and for the assembly of new viral particles.So, the correct option is option E, viral assembly.
4. Capsid proteins present on the capsid shell of the cold viruses are required for the attachment of the virus to the host cell. Binding of zinc to capsid proteins decreases cold severity as the attachment of the virus to the host cell is inhibited. So, the correct option is option A, interferes with attachment to host cell.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.