Endosymbiotic Similarities in Cellular Structures

Steps:

• Identify shared traits: prokaryotes, mitochondria, and chloroplasts all have 70S ribosomes and circular DNA, per endosymbiotic theory.
• Examine options for accurate matching to diagram labels, avoiding eukaryotic features like linear DNA.
• Note D assigns 70S ribosomes twice (positions 2 and 4), matching both organelles' prokaryote-like ribosomes.
• Confirm D sequences prokaryotes first, then shared ribosome, mitochondrion, another ribosome, and chloroplast, aligning with typical diagram groupings.

Why D is correct:

• It matches prokaryote-derived features: both mitochondria and chloroplasts retain 70S ribosomes, as defined by endosymbiotic origin from bacteria.

Why the others are wrong:

• A: Includes linear DNA (position 4), a eukaryotic nuclear trait, not shared by these structures.
• B: Includes linear DNA (position 4), incorrectly attributing it to prokaryote-like organelles.
• C: Includes linear DNA (position 2), misaligning with circular DNA in prokaryotes and organelles.

Final answer: D