Biotic Theory

a. Competition

b. Parasitism

c. Predation 

TLS Online TPP Program

#Id: 587

#Unit 2. Cellular Organization

A value of MOI = 1 implies that on an average there is a single host cell for a single phage particle.

TLS Online TPP Program

#Id: 588

#Unit 2. Cellular Organization

If 100,000 viral particles are added to one million host cells, the MOI is 0.1 means lytic cycle. High MOI means lysogenic cycle.

TLS Online TPP Program

#Id: 589

#Unit 2. Cellular Organization

If the number of phage particles is two or more, it is more likely to produce lysogney. And as the numbers of phage per cell become lower and lower, the tendency toward lytic infection increases, and as it becomes higher and higher, the likelihood of lysogeny similarly increases.

TLS Online TPP Program

#Id: 590

#Unit 2. Cellular Organization

Virulent phage replicate and kill their host by lysing but Temperate phage such as l, infect cells but don’t necessarily kill.

TLS Online TPP Program

#Id: 591

#Unit 2. Cellular Organization

Lambda phage chooses fate of lytic cycle under stress such as DNA damage 

TLS Online TPP Program

#Id: 592

#Unit 2. Cellular Organization

Genetic Map of Phage l The genome is 48,514 bp