Questions: DNA and RNA molecules consist of long chains of smaller units called phosphate groups nucleotides sugars purines

DNA and RNA molecules consist of long chains of smaller units called phosphate groups nucleotides sugars purines

Solution

The answer is the second one (or B): nucleotides.

Explanation for each option:

Phosphate groups: These are components of nucleotides, but they are not the smaller units that make up the entire DNA or RNA molecule.
Nucleotides: Correct. DNA and RNA molecules are long chains of nucleotides, which are the basic building blocks of these molecules. Each nucleotide consists of a phosphate group, a sugar, and a nitrogenous base.
Sugars: These are part of the nucleotides (specifically, deoxyribose in DNA and ribose in RNA), but they are not the smaller units that make up the entire DNA or RNA molecule.
Purines: These are a type of nitrogenous base found in nucleotides (adenine and guanine), but they are not the smaller units that make up the entire DNA or RNA molecule.

Summary: DNA and RNA molecules consist of long chains of smaller units called nucleotides.

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