Question

which three features distinguish archaeal cells from bacterial cells? different rrna sequences have flagella for motility contain membrane - bound organelles unique membrane lipids distinctive cell walls contain a nucleus

Explanation:

1. Different rRNA sequences: This is a core molecular difference that originally defined archaea as a separate domain from bacteria.
2. Unique membrane lipids: Archaeal membranes have branched, ether-linked lipids, while bacterial membranes have unbranched, ester-linked lipids.
3. Distinctive cell walls: Bacterial cell walls often contain peptidoglycan, while archaeal cell walls lack this molecule and have unique structural components.

The other options are incorrect: both archaea and bacteria can have flagella, neither have membrane-bound organelles nor a nucleus (they are prokaryotes).

Answer:

• Different rRNA sequences
• Unique membrane lipids
• Distinctive cell walls