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

Which set of features makes chloroplasts look like descendants of once free-living bacteria?

A.Circular DNA, bacterial-style ribosomes, and a surrounding double membrane
B.Linear chromosomes wrapped around histone-bound chromatin
C.A single enclosing membrane continuous with the Golgi
D.Dependence on spindle fibers assembled by centrioles to divide

Explanation

Core Concept

Chloroplasts carry their own circular chromosomes resembling bacterial genomes rather than linear eukaryotic chromosomes. Their ribosomes match bacterial ribosomes in size and drug sensitivity, and gene sequences align with cyanobacteria. A double envelope fits engulfment of a prokaryote, pairing the ancestral inner membrane with a host-derived outer one, and division resembles bacterial fission.

Correct Answer

ACircular DNA, bacterial-style ribosomes, and a surrounding double membrane

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