A Scientist Labels ACh with Fluorescent Dye to Be Able

Multiple Choice

A scientist labels ACh with fluorescent dye to be able to visualize under the microscope where ACh travels and binds.She takes an image of the motor end plate and see that ACh is

A) bound to muscarinic receptors at the end plate.
B) inside the muscle cell sarcoplasm.
C) bound to acetylcholinesterase in the end plate membrane.
D) bound to receptors on the sarcoplasmic reticulum.
E) bound to Ca²⁺ ions.