Two regions of a mitochondrion are labeled A (innermost compartment) and B (between membranes).
Which best identifies regions A and B?
- A
A = lumen; B = matrix
- Bcheck_circle
A = matrix (Krebs); B = intermembrane space (high H+)
- C
A = stroma; B = thylakoid
- D
A = cytosol; B = inner membrane
Explanation
The matrix (A) holds Krebs enzymes. Between inner and outer membranes is the intermembrane space (B), which accumulates H+ pumped by the ETC.