Nucleic acids in animal cell organelles

Steps:

• Recall nucleic acids include DNA (genetic material) and RNA (protein synthesis).
• DNA is stored in the nucleus of eukaryotic animal cells.
• RNA is produced in the nucleus but functions mainly in the cytoplasm, including at ribosomes.
• In a typical diagram, label 1 is the nucleus, 2 is the cytoplasm or ribosomes, and 3 is an organelle like mitochondria or vacuole without primary nucleic acid storage.

Why A is correct:

• Nucleic acids are defined as DNA in the nucleus (1) and RNA in the cytoplasm/ribosomes (2), excluding other organelles.

Why the others are wrong:

• B includes 3, but 3 lacks nucleic acids as it represents a non-genetic organelle.
• C excludes 1, ignoring DNA's primary nuclear location.
• D includes 3, overextending beyond standard nucleic acid sites.

Final answer: A