Polypeptides Can Have Which of the Following Types of Effects

Question

Polypeptides can have which of the following types of effects?
A) autocrine
B) paracrine
C) endocrine
D) all of the above
E) only A and C

Accepted Answer

Polypeptides can have autocrine effects, meaning they can act on the same cell that produced them. They can also have paracrine effects, meaning they act on nearby cells. Lastly, they can have endocrine effects, meaning they can act on distant cells after being secreted into the bloodstream. Therefore, the best choice is D, which indicates that polypeptides can have all three types of effects.