what does it mean when it says that "cells cannot cleave indicator molecule."

What does cleave mean?

From one of the Online Dictionaries:

Main Entry: cleave !klEv
Pronunciation: \ ˈklēv \
Function: intransitive verb
Inflected Form(s): cleaved!klEvd \ ˈklēvd \ or clove!klOv \ ˈklōv \ also clave!klAv \ ˈklāv \ , cleaved, cleav·ing,
Etymology: Middle English clevien, from Old English clifian; akin to Old High German kleben to stick
Date: before 12th century
Results
before 12th centuryto adhere firmly and closely or loyally and unwaveringly- Synonym - see stick
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