There is a tremendous variety of signal transduction pathways with a wide range of functions. However, all these pathways have some things in common. Discuss some of these common features
What will be an ideal response?
Answer: All signal transduction pathways start with a ligand, the chemical message, binding to a receptor. The receptor will change its conformation because the weak bonds that hold the protein in one conformation change when the ligand binds. This leads to the activation of an intracellular substance, which may activate another substance. This cascade of events allows a very small original signal to amplify the signal in its target cell.
You might also like to view...
A term having the opposite meaning of cephalad is ___________________.
Fill in the blank(s) with the appropriate word(s).
How would blocking the activity of acetylcholinesterase affect skeletal muscle?
A) It would make the muscles less excitable. B) It would produce muscle weakness. C) It would cause spastic paralysis (muscles are contracted and unable to relax). D) It would cause flaccid paralysis (muscles are relaxed and unable to contract). E) It would have no effect on skeletal muscles.
As soon as a person sees a cup of lemon juice, they start to salivate. This is an example of
A. positive feedback. B. adaptation. C. negative feedback. D. feedforward regulation. E. None of the choices are correct.
Which muscle closes the eye?
A) Frontalis B) Orbicularis oris C) Corrugator supercilii D) Orbicularis oculi