Diatoms, photosynthetic protists that live in the ocean, possess strange chlorop

Question

Diatoms, photosynthetic protists that live in the ocean, possess strange chloroplasts with four membranes instead of two. The leading hypothesis explaining this is that the chloroplasts in diatoms actually represent eukaryotic cells that formed symbiosis with the diatoms. The inner two membranes represent the membranes of the regular chloroplasts contained in this symbiotic cell. The outer two membranes represent the plasma membrane of the symbiotic cell and the food vacuole it was trapped in. Which of the conclusions below is supported by this new information?


Photosynthetic cells are all descendants of the first cell that evolved photosynthesis.

Diatom chloroplasts are not related to the chloroplasts found in other eukaryotic cells.

The process of photosynthesis evolved multiple times.

Diatoms acquired photosynthesis after the evolution of the chloroplast.

Diatoms are actually prokaryotic cells with a eukaryote living inside.

The chloroplasts in diatoms are more efficient than those in other eukaryotic cells.

Explanation / Answer

Photosynthetic cells are all descendants of the first cell that evolved photosynthesis.

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