Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologymediummcq1 pt

Which evidence supports the endosymbiotic origin of mitochondria?

A.They have their own circular DNA and ribosomes
B.They are surrounded by a single membrane
C.They contain linear chromosomes with histones
D.They synthesize their own ribosomes from nuclear mRNA

Explanation

Core Concept

Mitochondria retain several features consistent with bacterial ancestry, including a small circular genome, division by fission, a double-membrane organization, and bacterial-type translation machinery. Modern mitochondrial ribosomes differ substantially among eukaryotes and mammalian mitoribosomes are not literally 70S, so 'bacterial-type ribosomes' is the safer evidence statement.

Correct Answer

AThey have their own circular DNA and ribosomes

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