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
  1. Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population.

  2. 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).

  3. No, because very few viruses are lethal, yet many are highly infectious. The two values should ALWAYS be different.

  4. 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.

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TLS Online TPP Program

#Question id: 3450

#Unit 11. Evolution and Behavior

This behavior, in which individual members of a species maintain exclusive use of an area that contains some limiting resource, such as foraging ground, food, or potential mates, is called

TLS Online TPP Program

#Question id: 3451

#Unit 11. Evolution and Behavior

Individual A can derive fitness benefit of 220 units by helping Individual B, but incurs a fitness cost of 50 units in doing so following Hamilton’s rule, which of the following relation is not apply for altruism?

TLS Online TPP Program

#Question id: 3452

#Unit 11. Evolution and Behavior

Which of the following is advantage of group living?

TLS Online TPP Program

#Question id: 3453

#Unit 11. Evolution and Behavior

The degree of genetic relatedness between the offspring and their parents is

TLS Online TPP Program

#Question id: 3454

#Unit 11. Evolution and Behavior

Altruism is favoured when rb - c > 0 where c is fitness cost to altruist, b is fitness benefit to recipient; and r is genetic relatedness. It is under negative selection when

TLS Online TPP Program

#Question id: 3455

#Unit 11. Evolution and Behavior

A duck egg is removed from its mother’s nest and incubated by a barnyard hen. The duckling hatches out in the presence of the barnyard hen and stays in her nest. After a couple of days, the duckling is presented with a choice between its biological mother and the hen that incubated it. The duckling approaches and follows the hen. This set of observations demonstrates the phenomenon of