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Steroid hormones, such as testosterone, pass through the plasma membrane and bind to an intracellular protein, as shown in the diagram below.  The hormone-receptor complex then enters the nucleus, where it interacts with DNA to promote transcription of a specific gene.  Based on the information presented, which of the following will also occur in response to steroid signaling?

A DNA mutation changes the shape of the extracellular domain of transmembrane receptor protein A produced by the cell.  Which of the following prdictions is the most likely consequence of the mutation?

Brown fat, which is found in newborn infants and hibernating mammals, has uncouple proteins that, when activated, make the inner mitochondrial membrane leaky to H+.  What is the function of brown fat?

In an experiment, mice were allowed to breathe oxygen gas (O2) laced with radioactive oxygen.  In this experiment, the radioactive oxygen atoms quickly showed up in

Which of the following is the best explanation for the fact that most transduction pathways have multiple steps?

Increased amounts of carbon dioxide in the atmosphere are correlated with increased global surface temperatures. Based on the data, predict how a surface temperature that continues to rise above 40°C most likely affects the amount of energy available to primary consumers in an ecosystem. Provide reasoning to justify your prediction. 

Describe the role of ATP in the regulation of glycogen synthase activity. Explain how the addition of a phosphate group to certain amino acids of glycogen synthase can result in the inhibition of glycogen synthase.

A researcher has found a way to manipulate the pH inside mitochondria.  She found that raising the pH of the intermembrane space, without changing the pH of the mitochondrial matrix or cytoplasm caused

How do second messengers like IP3 relate to ion channel function in the context of blood vessel relaxation?