INTRODUCTION TO MICROSCOPY CELL BIOLOGY
MITOCHONDRIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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We know that endosymbiosis happened first with mitochondria and later with chloroplast. Why?
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Mitochondria make energy and cells need energy more than the sugars produced by chloroplasts.
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All eukaryotes have mitochondria including plants and algae, but only plants and algae have chloroplasts as well as mitochondria. This suggests, that the first eukaryotic cells first accquirred mitochondria and chloroplasts came later.
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We actually do not know which one came first-this happened too long ago for us to know about.
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None of the above
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Explanation:
Detailed explanation-1: -The evidence suggests that these chloroplast organelles were also once free-living bacteria. The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them.
Detailed explanation-2: -The first endosymbiotic event occurred when a eukaryotic cell engulfed a prokaryote (SF Fig. 2.4 Step 3). This process, known as primary endosymbiosis, created the mitochondrion. Chloroplasts likely evolved when a eukaryotic cell containing mitochondria engulfed a photosynthetic cyanobacteria cell (SF Fig.
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