PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mitochondria evolved from photosynthetic bacteria
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An aerobic host cell engulfed an anaerobic bacterium
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Animal cells evolved from plant cells
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An anaerobic host cell engulfed an aerobic bacterium
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Detailed explanation-1: -Explanation: Bacteria, a prokaryote, has circular DNA, as do mitochondria and chloroplasts. This provides support for the Endosymbiotic Theory, which states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote).
Detailed explanation-2: -At some point, a eukaryotic cell engulfed an aerobic prokaryote, which then formed an endosymbiotic relationship with the host eukaryote, gradually developing into a mitochondrion.
Detailed explanation-3: -Evidence for Endosymbiosis Evidence that supports the extracellular origins of these organelles can be seen by looking at certain key features: Membranes (double membrane bound) Antibiotics (susceptibility) Division (mode of replication)
Detailed explanation-4: -The correct answer is (c) A prokaryotic cell was ingested by a eukaryote and eventually became an organelle. Endosymbiosis is a theory that explains the origin of organelles in eukaryotic cells.