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

AP Biologyeasymcq1 pt

Where is the main chromosome of a bacterial cell located?

A.Inside a membrane-bound nucleus next to the Golgi apparatus

B.In the nucleoid, a cytoplasmic region not enclosed by membrane

C.Within mitochondria inherited from an ancestral symbiont

D.Anchored outside the plasma membrane by histone octamers

Explanation

Core Concept

Bacteria lack a membrane-bound nucleus, so their main chromosome occupies a nucleoid region within the cytoplasm. Nucleoid-associated proteins and DNA supercoiling compact the chromosome while allowing replication and transcription. Many bacterial chromosomes are circular, but chromosome shape is not universal and is not what defines the nucleoid.

Correct Answer

BIn the nucleoid, a cytoplasmic region not enclosed by membrane

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