Signal transduction pathways basically receive a stimulus from a source, which can be external or internal, and pass the message in a series of activation/deactivation reactions that will eventually illicit a cellular response. From the given statement, it can be deduced that XrB gives the signal to inhibit (i.e. significantly reduce the rate) cell division. Basically, XrB is the stimulus, while cell cycle inhibition is the response.
After a protein called XrB binds to its receptor on the surface of a cell, a signal transduction pathway leads to inhibition of the cell cycle. A mutant cell line is discovered in which one of the relay proteins in the signal transduction pathway isabsent. What would be the outcome for the mutant cells?
A. the cell never divides
B. the cells only divide when XrB is present
C. the cells only divide when XrB is absent
D. the cells divide whether XrB is present or absent
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