Practice Questions

TLS Online TPP Program

#Question id: 1077

Would ID50 and LD50 necessarily be the same for a given virus? Why or why not?

#Unit 4. Cell Communication and Cell Signaling

Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population.
No, because a virus may be highly infectious (very low ID50 value) but only marginally lethal (very high LD50 value). A prime example of this is the rhinovirus (common cold virus).
No, because very few viruses are lethal, yet many are highly infectious. The two values should ALWAYS be different.
Yes, because what we're actually describing here is infection/killing of individual CELLS, not of entire organisms. If a cell is infected, it will always be killed.

More Questions

TLS Online TPP Program

#Question id: 11742

#Unit 6. System Physiology – Plant

Mature sieve elements external view, showing sieve plates. The pores in the sieve plates between the sieve tube elements are open channels, what is the relevance of this open pores in the sieve plates?

TLS Online TPP Program

#Question id: 28931

#Unit 4. Cell Communication and Cell Signaling

Which of the following activity dissociates Fu-Cos2-Ci complex?

TLS Online TPP Program

#Question id: 15418

#Unit 5. Developmental Biology

In which type of interaction, the responding tissue has already been specified and needs only an environment that allows the expression of particular traits?

TLS Online TPP Program

#Question id: 23077

#Unit 12. Applied Biology

What is the effect of excess accumulation of metabolite products (lactate and ammonium) on cells?