Question

animal and plant cells
quiz complete
1
which term describes an extensive network of tubes, sacs, and vesicles throughout a cell that provides transport as its
main function?
cell membrane
endoplasmic reticulum
centriole
cell wall
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Explanation:

• Cell membrane: Forms the outer boundary of the cell and controls what enters and exits the cell. It is not a network of tubes, sacs, and vesicles for transport.
• Endoplasmic reticulum: It is an extensive network of membranes (tubes, sacs - cisternae). The rough ER (with ribosomes) is involved in protein synthesis and transport (proteins move through the ER lumen). The smooth ER is involved in lipid synthesis and also has a role in detoxification and transport of synthesized lipids within the cell.
• Centriole: Involved in cell division (formation of spindle fibers in animal cells). Has no role in transport as a network of tubes, sacs etc.
• Cell wall: Provides structural support and protection to plant cells (and some prokaryotes). It is a rigid layer outside the cell membrane and not a transport - related network.

Answer:

endoplasmic reticulum