Shared photosynthetic structures in eukaryotes and prokaryotes

Steps:

• Identify palisade mesophyll cells as eukaryotic plant cells containing chloroplasts with thylakoids, 70S ribosomes in organelles, nucleus, and mitochondria.
• Identify photosynthetic prokaryotes (e.g., cyanobacteria) as lacking membrane-bound organelles but possessing thylakoid membranes for photosynthesis and 70S ribosomes.
• Compare structures: both have 70S ribosomes (1) and thylakoid membranes (3) for protein synthesis and light-dependent reactions.
• Eliminate unique features: prokaryotes lack nucleus (2) and mitochondria (4).

Why C is correct:

• C selects 1 and 3 only, matching the shared 70S ribosomes and thylakoids essential for photosynthesis and translation in both cell types.

Why the others are wrong:

• A includes 4 (mitochondria), absent in prokaryotes.
• B includes 2 (nucleus), absent in prokaryotes.
• D excludes 1 and 3, omitting key shared structures.

Final answer: C