Concept:
DNA (Deoxyribonucleic Acid) is the hereditary material present in living organisms. In eukaryotic cells, DNA is enclosed within a well-defined nucleus and organized into chromosomes.
The other options given are not types of cells:
• Polypeptides are chains of amino acids.
• Exonuclease is an enzyme involved in DNA processing.
• Glycosylases are enzymes involved in DNA repair.
Step 1: Identify the correct biological cell type related to DNA.
DNA is characteristically present within the nucleus of:
\[
\text{Eukaryotic Cells}
\]
Step 2: Eliminate incorrect options.
The remaining options refer to proteins or enzymes rather than cell types.
Hence, the correct answer is:
\[
\boxed{(B)\ \text{Eukaryotic Cells}}
\]