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Question:

Expressed Sequence Tags (ESTs) refers to?

Polypeptide expression

Genes expressed as RNA

DNA polymorphism

Novel DNA sequences

Solution:

Correct option is A. Genes expressed as RNA. Expressed Sequence Tags (ESTs) are DNA sequences (genes) that are expressed as mRNA for protein synthesis. These are used in the human genome project for gene mapping. So, the correct answer is 'Genes expressed as RNA'.