Donor Strain ABCDE transformation to   recipient strain abcde. Co-transformation check by using media with different supplement?

Media supplement					Growth
A	B	C	D	E	Yes
-	+	-	+	+	Yes
+	+	-	-	+	Yes
+	-	+	-	+	Yes
+	-	+	+	-	Yes

What is a order of gene ?

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#Question id: 9244

#Unit 9. Diversity of Life Forms

One characteristic that distinguishes a population in an extinction vortex from most other populations is that

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#Question id: 20327

#Unit 4. Cell Communication and Cell Signaling

What happens when Vibrio fischeri are at a high density on squid?

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#Question id: 3815

#Unit 3. Fundamental Processes

Use the figure to answer the following question. A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in 15N medium for several generations and then transfer them to 14N medium. Which pattern in the figure would you expect if the DNA was replicated in a conservative manner?

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#Question id: 18851

#Unit 13. Methods in Biology

Nickel-NTA (Ni-NTA) chromatography is a popular affinity chromatography method for the purification of histidine-tagged proteins. However, SDS-PAGE of the eluted protein can show bands in addition to your target protein. How might you improve this purification step?

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#Question id: 12436

#Unit 10. Ecological Principles

A diagram of a food web, for the following questions. (Arrows represent energy flow and letters represent species.)

If this were a terrestrial food web, the combined biomass of C + D would probably be