Which of the following will show highest migratory distance on electrophoresis

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#Question id: 5033

#Unit 11. Evolution and Behavior

Which of the following statements is correct in regard to Homo erectus?

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#Question id: 11253

#Unit 10. Ecological Principles

Experiments conducted by Francisco Ayala with fruit flies and by David Pimentel with houseflies and blowflies have demonstrated the rather interesting phenomenon that __________.

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#Question id: 172

#Unit 1. Molecules and their Interaction Relevant to Biology

Which amino acid is least likely to participate in acid-base catalysis?

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#Question id: 16126

#Unit 13. Methods in Biology

2 You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS, that could explain the effect of the gln2– and gln3– mutations on the regulation of GLN1.

The GLN1 gene shows a rather complex regulation in response to different amino acids. When either glutamate (glu) or glutamine (gln) is added to the medium, the amount of GS expression diminished and when both glutamate and glutamine are added to the medium GS expression is shut off completely. The effects of different mutants on the response to glu and gln are shown below.

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#Question id: 598

#Unit 1. Molecules and their Interaction Relevant to Biology

Which might be a method used for distinguishing among several mechanistic possibilities in a multi-substrate reaction?