Question

phosphate group, guanine (a nitrogenous base), deoxyribose, phosphate group, uracil (a nitrogenous base), ribose, phosphate group, cytosine (a nitrogenous base), ribose, phosphate group, adenine (a nitrogenous base), deoxyribose, dna nucleotides, rna nucleotides

Explanation:

Assuming the question is to identify which boxes are DNA nucleotides and which are RNA nucleotides:

• DNA nucleotides have deoxyribose (lacks an -OH on the 2' carbon of the sugar, has -H instead) and nitrogenous bases adenine, guanine, cytosine, thymine (not shown here, but guanine and adenine with deoxyribose are DNA - like).
• RNA nucleotides have ribose (has -OH on 2' carbon) and nitrogenous bases adenine, guanine, cytosine, uracil (uracil and cytosine with ribose are RNA - like).

Answer:

DNA nucleotides: Top - left (guanine with deoxyribose), Bottom - right (adenine with deoxyribose)
RNA nucleotides: Top - right (uracil with ribose), Bottom - left (cytosine with ribose)