A scientist discovers a unicellular organism that lives in extreme salt and has a rigid layer around its cell membrane. Which feature would most strongly show this layer is a plant-like cell wall?
The outer layer is composed mainly of cellulose fibers
The cell wall of plant cells is a rigid layer outside the cell membrane, and its main component is cellulose, a polysaccharide that forms long, strong fibres. So a layer made mainly of cellulose fibres would most strongly show that it is a plant-like cell wall.
Chitin is the main component of the cell wall of fungi (and of the outer skeleton of insects), and peptidoglycan is the characteristic component of bacterial cell walls. These layers are rigid too, but they would point to a fungus-like or bacteria-like wall, not a plant-like one.
A lipid bilayer arrangement is the structure of a cell membrane, not of a cell wall, so it would not show that the outer layer is a plant-like wall at all.
Hence, The outer layer is composed mainly of cellulose fibers.
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