Which one of the following RNA secondary structure prediction methods is based on the principle of locating lowest energy minimum in the conformation space of a RNA structure? 

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#Question id: 16126

#SCPH01 Biochemistry

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: 1091

#SCPH06 I Botany

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

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#Question id: 10981

#SCPH28 | Zoology

Which of the following structures will have the slowest rate of conduction of the cardiac action potential?

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#Question id: 6944

#SCPH28 | Zoology

Which would lead to a dorsalized embryo? (Recall that genes in Drosophila are named for their mutant phenotype.

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#Question id: 69

#SCPH06 I Botany

Which of the following is the diastereomer of the following compound?