Cell Compartmentalization

AP Biology· difficulty 2/5

The compartmentalization provided by membrane-bound organelles allows

  • A

    More rapid assembly of ribosomal subunits in the cytosol of metabolically active cells

  • B

    Storage of additional copies of nuclear DNA per cell within distinct organelle lumens

  • C

    Spatial separation of incompatible chemical reactions and concentration gradients

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  • D

    Faster fusion of secretory vesicles with the plasma membrane during regulated exocytosis

Explanation

Eg., lysosomes maintain acidic pH for hydrolytic enzymes; mitochondria maintain proton gradients; nucleus separates transcription from translation.

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