Biology A-Level
washing and controlled variables
What washing and controlled variables means in Biology A-Level, as defined for AQA.
Definition of washing and controlled variables
Check what you remember
Read the wording for your board, then hide it and explain washing and controlled variables in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Cut cylinders are washed thoroughly to remove pigment released by the cells cut at the surface, and the volume of solution, the exposure time, and the size and number of beetroot pieces are controlled.
Topics that use washing and controlled variables
- Transport across cell membranes (AQA A-Level)
Related terms
- active transport
- betalain pigment leakage
- calibration curve
- colorimetry and absorbance
- cristae
- Fluid mosaic model
- glycoproteins and glycolipids
- hydrophilic heads and hydrophobic tails
Using washing and controlled variables in the exam
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