Which statement about extracellular structures (plant cell walls and the extrace
ID: 13551 • Letter: W
Question
Which statement about extracellular structures (plant cell walls and the extracellular matrix of animal cells) is correct?1-Information can be transmitted from these extracellular structures to the cytoplasm.
2- Extracellular structures store energy in the form of polysaccharides for subsequent metabolism by the cell.
3- All extracellular structures form barriers to separate adjacent cells.
4-Proteins and lipids are common components of extracellular structures.
5- Extracellular structures regulate the passage of water molecules across the cell membrane.
Explanation / Answer
It is 1.
Information, typically in the form of hormones or other small molecules that cannot pass through the cell membrane will bind to molecules on the surface and cause a chemical change inside the cell. Likewise, physical movement of someextracellular structures will transmit a signal to the inside of the cell. Many of the touch and pressure sensors in skin work this way.
Extracellular structures are structural not energy storage materials so 2 is wrong.
Some extracellular structures, especially in plant cells have structures to connect adjacent cells so 3 is wrong.
Extracellular structures are mostly proteins and carbohydrate polymers not lipid so 4 is wrong.
While some extracellular structures may slow water passage there is no regulation, the cell membrane does this itself so 5 is wrong.
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