Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

Which of the following organisms is incorrectly paired with its trophic level? 

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#Question id: 16134

#Unit 13. Methods in Biology

You obtain 6 BACs (of known order, as shown below) and 7 STSs (of unknown order) that derive from a region of mouse chromosome 16 whose genomic sequence has not yet been finished.   

 

By PCR (using 20-bp primers at either end of each STS), you test each of the 6 BACs for the presence (+) or absence (-) of each of the 7 STSs. You obtain the following results:

 

You determine the DNA sequences of PCR products obtained at STS5 using BACs B, C, D, E, and F as PCR templates. The DNA sequences of PCR products obtained using BACs B and C are identical, but they differ by several nucleotide substitutions from the DNA sequences of PCR products obtained using BACs E and F. Oddly, PCR product obtained using BAC D appears to be a mixture of two sequences – one corresponding to the BAC B/ BAC C sequence and the other corresponding to the BAC E/ BAC F sequence. Briefly account for these findings, and explain how a single PCR assay could amplify two different sequences.

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#Question id: 8938

#Unit 9. Diversity of Life Forms

Cephalization is primarily associated with

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#Question id: 4176

#Unit 3. Fundamental Processes

The unambiguity and degeneracy of the genetic code can best be respectively exemplified by which of the following?

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#Question id: 12452

#Unit 10. Ecological Principles

Butterflies are used as an example of a species with

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#Question id: 28036

#Unit 1. Molecules and their Interaction Relevant to Biology

The protein p27 is

a. a highly ordered protein

b. a intrinsically disordered protein

c. p27 inhibits cyclin-dependent kinases (CDKs)  

d. p27 promotes cyclin-dependent kinases (CDKs

Which of the following is correct