Which of the following is a dimer?

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(A) dimer is a molecule or molecular complex consisting of two identical or similar subunits (monomers) linked together.Sucrose is a disaccharide form

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Sucrose

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(A) dimer is a molecule or molecular complex consisting of two identical or similar subunits (monomers) linked together.Sucrose is a disaccharide formed by the condensation of two monosaccharides: $1$ molecule of glucose and $1$ molecule of fructose.Cellulose and chitin are polysaccharides (polymers of many monosaccharide units).Glucose is a monosaccharide (a single unit).Therefore,sucrose is the correct answer as it is a dimer of two monosaccharides.

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