Final answer:
Intermediate space refers to the intermembrane space found between the two membranes of the mitochondria, playing a key role in ATP production.
Step-by-step explanation:
Intermediate space refers to the space between the two membranes of the mitochondria. The mitochondrion, which is often described as the powerhouse of the cell, has an outer membrane and an inner membrane. The space that lies between these two phospholipid bilayers is known as the intermembrane space. This compartment plays a crucial role in the process of cellular respiration, especially during the electron transport chain, where it contributes to the generation of adenosine triphosphate (ATP), the cell's energy currency.
While both mitochondria and chloroplasts have double membranes and are involved in ATP production, the chloroplast has different structures like thylakoids and grana, whereas the unique features of mitochondria include the intermembrane space and inner folds called cristae.