A  plant species arrives at  an  island  for the first time, where it  is  exposed to  a  new set of  pollinators.  Over the course of 20 generations, the characteristics of its flowers change. The figures above show the frequency distribution of petal length in the original colonizing population (Figure 1) and 20 generations later (Figure 2). Which of these explanations is consistent with the observed change in petal length?

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#Question id: 10591

#Unit 10. Ecological Principles

The following figure shows distribution pattern of species. 

Based on the above, which of the following distribution correct?

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#Question id: 19304

#Unit 12. Applied Biology

What happens to signal peptides after the protein has been translocated to the desired location, to generate the mature functional proteins

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#Question id: 11277

#Unit 10. Ecological Principles

If a species is a keystone predator, then its removal from a community should

(A) Increase population size of the predator’s preferred prey

(B) decrease species diversity in the prey community

(C) decrease productivity of the predator’s preferred prey

(D) increase species diversity in the prey community

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#Question id: 15525

#Unit 4. Cell Communication and Cell Signaling

In the instructive model, TCR/CD4 and TCR/CD8 coengagement generates unique signals, if a thymocyte randomly generated a TCR with an affinity for MHC Class I. which thymocyte would bind with MHC class I?

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#Question id: 8854

#Unit 9. Diversity of Life Forms

Which cells in a sponge are primarily responsible for trapping and removing food particles from circulating water?