A Levels Biology (9700)•9700/12/O/N/20
Explanation
Telomeres are end caps on linear eukaryotic chromosomes
Steps:
- Identify structures with genetic material: assume common biology list like nucleus, mitochondria, chloroplasts, plasmids, viruses.
- Recall telomeres cap linear DNA to prevent degradation.
- Note only eukaryotic nuclear chromosomes are typically linear with telomeres; others (mitochondrial, chloroplast, plasmid) have circular DNA without telomeres.
- Count: only 1 structure (nucleus) qualifies.
Why A is correct:
- Telomeres define linear eukaryotic nuclear DNA per standard cell biology definition.
Why the others are wrong:
- B overcounts by including non-telomeric DNAs like mitochondrial.
- C adds irrelevant circular or viral structures.
- D assumes all listed have telomeres, ignoring circular DNA prevalence.
Not enough information on exact listed structures. Final answer: A
Topic: Structure of nucleic acids and replication of DNA
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