Microbiology Answers

1) During a lytic cycle, which genes are expressed (transcribed and translated)?

Group answers:

  All genes needed for viral replication. 

  Only genes needed by the host cell to defend itself against viruses will be expressed. 

  Both genes needed for viral replication and host cell genes are expressed. 

(The only genes that are expressed are those for viral spikes and capsids wasn't correct)

2)How do viruses hijack their host cells' processes?

Group answers:

Viruses release toxins into the host cell in-between the penetration and biosynthesis phases. 

The host cell's DNA is cut into pieces by enzymes that the viral nucleic acid encodes.

The prophage acts as an enzyme and cuts up host cell DNA. 

biochemical characteristic of gram positive bacteria

You are provided with a culture tube of P. aeruginosa, E. coli, Salmonella typhimurium , Shigella flexneri. What biochemical test is more accurate to differentiate them?

In redi’s meat experiment microorganisms are not grown then why in swan

neck microorganisms are grown automatically while both are in contact with

air?

2) Why swan neck experiment is considered as theory and challenged

spontaneous generation?