Question Details

Pick the odd one out

Options

A

Glycosomes

B

Hydrogenosomes

C

Mitochondria

D

Mitosomes

Correct Answer :

Glycosomes

Solution :

The correct option is Glycosomes.

To understand why Glycosomes is the odd one out, we can analyze the evolutionary origins and biological classifications of the given organelles:
1. Mitochondria, Hydrogenosomes, and Mitosomes: These three organelles are evolutionary relatives that belong to the mitochondrial lineage. They all evolved from a common endosymbiotic alpha-proteobacterial ancestor. While mitochondria perform aerobic respiration, hydrogenosomes function in anaerobic environments to produce hydrogen, and mitosomes are highly reduced organelles primarily involved in iron-sulfur cluster assembly. Despite their functional adaptations, they share key evolutionary and structural features, such as homologous protein import machineries, classifying them together as mitochondria-related organelles (MROs).
2. Glycosomes: Glycosomes are evolutionarily distinct from the mitochondrial lineage. They are specialized membrane-bound microbodies belonging to the peroxisome family, found exclusively in kinetoplastid protozoans (such as the parasites responsible for sleeping sickness). Their primary role is to compartmentalize the enzymes of glycolysis.

Because mitochondria, hydrogenosomes, and mitosomes share a single ancestral origin tracing back to the mitochondrial endosymbiont, while glycosomes belong to the peroxisome lineage, Glycosomes is the odd one out.

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