What Does It Mean to Say That a Signal Is

Multiple Choice

What does it mean to say that a signal is transduced?

A) The signal enters the cell directly and binds to a receptor inside.
B) The physical form of the signal changes from one form to another.
C) The signal is amplified, such that even a single molecule evokes a large response.
D) The signal triggers a sequence of phosphorylation events inside the cell.