Arrange the following events in the proper order in which they occur during transduction of the TGFβ signal:

a. association of Smad3 and Smad4  

b. phosphorylation of TGFβ receptor I by TGFβ receptor II            

c. phosphorylation of Smad3 by TGFβ receptor I     

d. nuclear import of Smad3   

e. binding of TGFβ to TGFβ receptor II  

#Question id: 10844

#Unit 10. Ecological Principles

In the formula for biotic potential (dN/dt = rIN), what does n stand for?

#Question id: 10845

#Unit 10. Ecological Principles

Pseudomyrmex ants live exclusively in the swollen thorns of acacia trees. In return for food and shelter provided by the trees, the ants aggressively defend the tree from leaf-eating insects. This interaction between ants and acacias represents an example of

#Question id: 10846

#Unit 10. Ecological Principles

Many birds readily feed upon periodic cicadas when they emerge as adults. This interaction between birds and cicadas represents an example of

#Question id: 10847

#Unit 10. Ecological Principles

In the stomachs of ruminants, such as cows, certain microbes digest cellulose, a material the cow cannot digest itself. This interaction between cows and microbes represents an example of

#Question id: 10848

#Unit 10. Ecological Principles

Intraspecific competition

A. Is seen only in species of animals

1. Through time, hosts become more resistant to parasitic infections and, if they are to be successful, parasites become less likely to cause the death of their hosts. This is an example of

#Question id: 10849

#Unit 10. Ecological Principles

Plasmodium is transmitted from human to human by the bite of a mosquito carrier. In this scenario plasmodium is the ________, the mosquito is the ________, and _______ is the role played by the human.