Final answer:
The cellular responses to signal transduction include changes in cytosolic proteins, release of more signal molecules, and altered enzyme activity; hence, all of the provided choices are correct.
Step-by-step explanation:
The cellular responses to signal transduction include a variety of changes within the cell that result from the cascade of events following the initial signal. Firstly, a change in the proteins found in the cytosol occurs as a direct result of modified gene expression or altered activity of existing proteins. In addition, the release of more signal molecules can occur, serving as secondary messengers within the cell or affecting neighboring cells. Lastly, a change in the activity of an enzyme is a frequent response to signal transduction, which can alter the cell's metabolic pathways, influence its growth, or initiate other cellular functions.
Therefore, the correct answer to the student's question is that all of the listed choices are cellular responses to signal transduction:
- A change in the proteins found in the cytosol
- The release of more signal molecules
- A change in the activity of an enzyme
Signal transduction mechanisms can have broad impacts on cellular function, including gene expression, metabolism, and enzyme activity, and can thereby direct a wide array of cellular responses.