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.              

How many units of ß-galactiosidase would you expect to be expressed from deletion 1 in a gln2– mutant? 

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#Question id: 2951

#SCPH05 I Biotechnology

Liver cells are highly specialized, but when the liver is damaged or parts of it are removed surgically, the tissue grows. Liver cells fall into which category of cells?

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#Question id: 406

#SCPH28 | Zoology

Hydrolysis of 1 M glucose 6-phosphate catalyzed by glucose 6-phosphatase is 99% complete at equilibrium (i.e., only 1% of the substrate remains). Which of the following statements is most nearly correct? (R = 8.315 J/mol·K; T = 298 K)

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#Question id: 307

#SCPH01 Biochemistry

An ionic compound A+ B– is most likely to be formed when________

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#Question id: 1084

#SCPH28 | Zoology

Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?

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#Question id: 1762

#SCPH05 I Biotechnology

What do Th1 cells secrete?