In a single strand from a DNA molecule, nucleotides are linked by covalent bonds between:

Sugar and phosphate groups

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Sugar and nitrogenous bases

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Phosphate groups and nitrogenous bases

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Nitrogenous bases

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Solution

The correct option is B Sugar and phosphate groups
The phosphate of one nucleotide is covalently bound (a bond in which one or more pairs of electrons are shared by two atoms) to the sugar of the next nucleotide through ester linkages.
So, the correct option is 'Sugar and phosphate groups'.

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A nucleotide consists of a sugar molecule, a nitrogenous base, and a phosphate group.

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A nucleotide consists of a pentose sugar molecule, a nitrogenous base, and a phosphate group.

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