A Levels Biology (9700)•9700/13/M/J/23
Explanation
Cellular structures housing nucleic acids
Steps:
- Nucleic acids (DNA, RNA) are genetic material in specific organelles.
- Identify structure 1: nucleus contains chromosomal DNA.
- Identify structure 2: lacks nucleic acids (e.g., lysosome holds enzymes/proteins only).
- Identify structure 3: mitochondria contain their own DNA for energy production.
Why C is correct:
- Option C selects nucleus (DNA) and mitochondria (DNA), matching definition of nucleic acid locations per cell biology.
Why the others are wrong:
- A includes 2, but structure 2 has no nucleic acids.
- B omits 3, excluding mitochondrial DNA.
- D selects only 3, ignoring nuclear DNA.
Final answer: C
Topic: Structure of nucleic acids and replication of DNA
Practice more A Levels Biology (9700) questions on mMCQ.me