A cell biologist extracts the dense homogeneous substance from the inner compartment of an isolated mitochondrion. Which of the following components will be absent in this extract?

Step-by-step solution

The inner compartment of the mitochondrion is filled with a dense homogeneous substance called the matrix. According to NCERT, the mitochondrial matrix possesses a single circular DNA molecule, a few RNA molecules, and 70S ribosomes (along with the components required for the synthesis of proteins). It does not contain 80S ribosomes, which are characteristic of the eukaryotic cytoplasm and rough endoplasmic reticulum. Therefore, 80S ribosomes will be absent in the extract. Answer: 80S ribosomes