Question

Crista junctions

A) are large pores.
B) are associated with the movement of materials from the cytosol into the mitochondrion.
C) contain the mitochondrial DNA.
D) are associated with the thylakoid membrane system.
E) limit the movement of products between the intracristae and intermembrane spaces.

Answer 1

Crista junctions in mitochondria limit the movement of products between the intracristae and intermembrane spaces, which is necessary for efficient ATP production.

Correct option is e. limit the movement of products between the intracristae and intermembrane spaces.

Step-by-step explanation:

The correct option that defines crista junctions in the context of mitochondrial structure is E) limit the movement of products between the intracristae and intermembrane spaces. The cristae are infoldings of the inner mitochondrial membrane that increase the surface area for ATP synthesis.

The intermembrane space is the area between the inner and outer mitochondrial membranes. Crista junctions help to maintain the distinct environments necessary for efficient energy production by limiting the exchange of materials between these two spaces. The mitochondrial matrix, which contains mitochondrial DNA, ribosomes, and metabolic enzymes, is found within the inner membrane but is not part of the crista junctions themselves.

Correct option is e. limit the movement of products between the intracristae and intermembrane spaces.