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There is no DNA in:

1. a mature RBC
2. a mature spermatozoan
3. hair root
4. an enucleated ovum

Correct answer: a mature RBC

Solution

A mature red blood cell in mammals has no nucleus, so it contains no nuclear DNA. The other options can contain DNA: sperm carries haploid DNA, hair root cells are nucleated, and an enucleated ovum is not the standard viable human egg cell.

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