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A2.2.4—Structures common to all cells

Every cell contains a plasma membrane, cytoplasm, genetic material, and ribosomes, providing controlled exchange, metabolic space, inherited information, and protein synthesis.

Syllabus
First assessment 2025
Objective
A2.2.4
Level
HL

Concept essentials

  • A plasma membrane encloses every cell and regulates exchange.
  • Cytoplasm supports cellular metabolism.
  • DNA stores the hereditary information of cells.
  • Ribosomes synthesize polypeptides in both prokaryotes and eukaryotes.
ConceptIB Biology HL