Question

the diagram shown here represents a portion of a nucleic acid molecule.the part indicated by the arrow could be adenine uracil deoxyribose phosphate

Explanation:

The diagram shows a double - helix structure, which is characteristic of DNA. DNA contains adenine as one of its nitrogenous bases. Uracil is found in RNA, not in the double - helix DNA structure shown. Deoxyribose is a sugar component, but the arrow is likely pointing to a base. Phosphate is part of the backbone, but the arrow's position (between the two strands) suggests a base. Adenine pairs with thymine in DNA.

Answer:

adenine