In a positive-feedback system where hormone A alters the amount of protein X,
A)an increase in A always produces an increase in X,which results in an increase in A.
B)an increase in X always produces a decrease in A,which results in a decrease in X.
C)a decrease in A always produces an increase in X,which results in an increase in A.
D)a decrease in X always causes a decrease in A,which causes an increase in X.

Question

Quizplus · Accepted Answer

In a positive-feedback system, an increase in A will lead to an increase in X, which in turn will amplify the original increase in A, creating a positive feedback loop. This means that choice A accurately describes how the system works.

In a Positive-Feedback System Where Hormone a Alters the Amount