volume_mute
Middle lamella — composition
publish date: 2026/06/16 20:56:39.916319 UTC
volume_mute
Where two cell walls come in contact, a layer called the middle lamella is laid down between the two cells. This continuous layer is usually composed of what?
Correct Answer
pectin
Explanation
The middle lamella — the layer between adjacent plant cell walls — is usually composed of pectin, specifically in the form of calcium pectate. Pectin acts as a glue that binds adjacent plant cells together. It is also what gives fruits their gel-like texture and is used commercially to make jams and jellies set.
Reference
Biology: A Self-Teaching Guide