There are at least a dozen known species in the extinct genus Lystrosaurus. If each species was suited to a quite different environment, then this relatively large number of species is likely due to

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#Question id: 18373

#XL - S Microbiology

Scientists engineered a bacterial strain of P. fluorescens which is able to degrade 2,4-dinitrotoluene. This bacteria also helps in 

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#Question id: 3786

#XL - Q Biochemistry

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

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#Question id: 11927

#XL - S Microbiology

A biologist discovers an alga that is marine, multicellular, and lives at a depth reached only by blue light. This alga probably belongs to which group?

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#Question id: 4585

#XL - S Microbiology

The cow Bos primigenius (which is bred for meat and milk) has a smaller brain and larger eyes than closely related wild species of ungulates. These traits most likely arose by ________.

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#Question id: 16475

#XL - R Botany

Cultures that facilitate cell-to-cell interactions and signaling among cells and allow their study, are