Apharmaceutical company sets out to design a drug to inhibit the response of cells to testosterone, a steroid hormone. which of the following is most likely to be the result of this drug? (a) a decrease in g protein activity (b) a decrease in transcriptional activity of certain genes (c) an increase in receptor tyrosine kinase activity (d) an increase in cytosolic calcium concentration

(B) a decrease in transcriptional activity of certain genes

Explanation:

Testosterone is a steroid hormone, for which receptors are present inside the cell as it can easily pass the lipid bilayer. Like other steroid hormones, testosterone shows its affects by modulating transcription of its responsive genes.

After binding with receptor, it makes a hormone-receptor complex that binds with promoters of its responsive genes. If a drug is inhibiting response of testosterone, it must be decreasing the transcriptional activity of some genes, which are modulated by testosterone.

Thus, the correct answer is option (b).

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

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