What powers the movement of proteins into the mitochondrial matrix?
A)electric potential across the inner mitochondrial membrane acting on the positively-charged targeting signal
B)electric potential across the outer mitochondrial membrane acting on the positively-charged targeting signal
C)ATP
D)GTP
E)electric potential across the inner mitochondrial membrane acting on the negatively-charged targeting signal

Question

Quizplus · Accepted Answer

The movement of proteins into the mitochondrial matrix is powered by the electric potential across the inner mitochondrial membrane acting on the positively-charged targeting signal. This targeting signal, called the presequence, is recognized by receptor proteins on the surface of the mitochondrial membrane and directed through into the matrix. The inner membrane has an electric potential gradient that is negative inside relative to outside, and positively charged presequences are attracted to this potential and pulled into the matrix. ATP and GTP are not directly involved in targeting proteins to the mitochondria.

What Powers the Movement of Proteins into the Mitochondrial Matrix