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B
Dictyosome
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C
Chromosome
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D
Cell membrane
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Solution
The correct option is D Cell membrane Sialic acid is a constituent of the cell membrane. It acts as a cell receptor. It is a monosaccharide with a nine-carbon atom. It helps to keep water on the surface of the cell as it provides the negative charge to the membrane which attracts positively charged water molecules. It helps in the uptake of cellular fluid.