The concentrations of ions are very different inside and outside a nerve cell due to ________.

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#Question id: 8705

#SCPH05 I Biotechnology

If you were using cladistics to build a phylogenetic tree of cats, which of the following would be the best outgroup?

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#Question id: 4341

#SCPH01 Biochemistry

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If a researcher moves the promoter for the lac operon to the region between the beta galactosidase (lacZ) gene and the permease (lacY) gene, which of the following results would be most likely?

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#Question id: 15618

#SCPH06 I Botany

Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1-, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac-). During an condition  isolate  a second Lac– mutation, which you designate lac2-. Using P1 phage on this strain and use the resulting phage lysate to infect the lac2- strain, selecting for   Kanr   transductants. In this case, all 100   Kanr   transductants that are examined are Lac–. What does this result tell you about the relationship between the lac1- and lac2- mutations?

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#Question id: 266

#SCPH12 I Genetics

________ plays an important role in storing the energy needed for the unwinding of DNA during replication, recombination, repair and transcription.

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#Question id: 9211

#SCPH28 | Zoology

Of the following ecosystem types, which have been impacted the most by humans?