Identifying structures with DNA or RNA

Steps:

• Recall nucleic acids are DNA and RNA, found in genetic material and protein synthesis machinery.
• Structure 1 (virus) contains nucleic acid as its genome.
• Structure 2 (ribosome) contains rRNA for translation.
• Structure 3 (nucleus) houses DNA and RNA.
• Structure 4 (lysosome) contains enzymes but no nucleic acids.

Why A is correct:

• Option A includes structures 1, 2, and 3, all defined by biology as containing nucleic acids per cell and molecular biology principles.

Why the others are wrong:

• B omits 2 and 3, which contain RNA and DNA.
• C omits 2, which contains rRNA.
• D excludes 1 and 3, both with nucleic acids.

Final answer: A