Biology A-Level
TEM and SEM principles
What TEM and SEM principles means in Biology A-Level, as defined for AQA.
Definition of TEM and SEM principles
Check what you remember
Read the wording for your board, then hide it and explain TEM and SEM principles in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A transmission electron microscope transmits electrons through an ultra-thin section to reveal 2D internal ultrastructure, while a scanning electron microscope sweeps a beam across a surface to produce a 3D image.
Topics that use TEM and SEM principles
- Methods of studying cells (AQA A-Level)
Related terms
- acceptance of scientific evidence
- artefact
- calibration
- magnification
- microscopy limitations
- optical vs electron microscopes
- resolution
- specimen preparation
Using TEM and SEM principles in the exam
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