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A2.2.3—Developments in microscopy

Advances in microscopy improve resolution, contrast, molecular specificity, and preservation, allowing cellular surfaces, internal ultrastructure, and selected molecules to be distinguished.

Syllabus
First assessment 2025
Objective
A2.2.3
Level
SL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceNovember 2017
Most common paperPaper2
Typical marks1

Common command terms

  • State
  • Identify

Scoring notes

Common mistake
Using magnification and resolution as if they describe the same property.

Recent exam appearances

November 2017Paper2 ["SL"] · TZ02(a)[ 1 ]A2.2.3—Developments in microscopy
Practice this objective

Coverage 2017–2017 · Updated 15 Jul 2026

Concept essentials

  • Resolution is the ability to distinguish two nearby points as separate.
  • TEM reveals internal ultrastructure in thin sections.
  • SEM reveals detailed surface form.
  • Fluorescent methods locate selected molecules or cellular structures.
ConceptIB Biology SL