Final answer:
D. Urea is the compound that does not tend to stabilize enzymes in cells.
Step-by-step explanation:
The compound that does not tend to stabilize enzymes in cells is Urea (option D).
Enzymes are biological catalysts that help facilitate chemical reactions in cells.
They often require specific conditions, such as optimal pH and temperature, as well as certain compounds to stabilize their structure and function.
While betaine (option A), trimethylamine oxide (option B), and glycine (option C) can all play roles in enzyme stabilization, urea does not exhibit the same stabilizing effects on enzymes.