Final answer:
Eukaryotic organisms in glacier ice have plasma membranes composed of phospholipids with embedded proteins. Sterols like cholesterol and specialized lipids like sphingolipids are also present.
Step-by-step explanation:
Eukaryotic organisms thriving in glacier ice are likely to have plasma membranes composed of phospholipids forming a bilayer with embedded peripheral and integral proteins. The plasma membrane of eukaryotic cells also contains sterols, such as cholesterol, which help alter membrane fluidity and maintain stability. Additionally, specialized lipids like sphingolipids may play a role in signal transduction pathways and cell-to-cell communication.