| Factor | Primary Mechanism of Damage | Effect on Membrane Components |
|---|---|---|
| Temperature | Increased kinetic energy and bond breakage | Denatures proteins and increases lipid fluidity |
| Solvents | Chemical dissolution of the bilayer | Dissolves phospholipids and disrupts hydrophobic interactions |
| Freezing | Physical piercing by ice crystals | Sharp crystals rupture the bilayer and tonoplast directly |
Identify Control Variables: Exams often ask for variables that must be kept constant. Always mention the volume of water, the surface area of beetroot, and the incubation time.
Explain the 'Why': When describing the effect of high temperature, do not just say 'the membrane breaks.' Specify that proteins denature and phospholipids move faster, creating gaps.
Zeroing the Colorimeter: Always mention 'blanking' or zeroing the colorimeter using a cuvette of pure distilled water before taking readings. This ensures that the absorbance measured is solely due to the leaked pigment.