Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Thrinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been warm-blooded. The fossils of Thrinaxodon are consistent with the hypothesis that ________.

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#Question id: 18851

#Unit 14. 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: 18852

#Unit 14. Methods in Biology

What is the starting point for selection of a suitable IEX matrix for purification of a recombinant protein?

TLS Online TPP Program

#Question id: 18853

#Unit 14. Methods in Biology

Your purification strategy of combinations of chromatography steps gives a protein preparation with a single band on SDS-PAGE. Which of the following would be best for determining the protein concentration (as mg/ml or molarity)?

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#Question id: 18854

#Unit 14. Methods in Biology

What properties of a protein does hydrophobic interaction chromatography exploit for purification?

TLS Online TPP Program

#Question id: 18855

#Unit 14. Methods in Biology

to elute target proteins from an affinity chromatography matrix, which of the following conditions would be the most appropriate?

TLS Online TPP Program

#Question id: 18856

#Unit 14. Methods in Biology

A scientist constructs a recombinant bacterial plasmid that contains a gene conferring resistance to the antibiotic ampicillin (amp). The scientist transforms cultures of E. coli bacteria with the recombinant plasmid, then incubates the cultures overnight on plates containing media without ampicillin (amp-) and with ampicillin (amp+).

Assuming the transformation protocol was successful, which of the following best predicts the bacterial growth pattern expected after the incubation period?