Chromosome Components in Mitosis

Steps:

• Recall that mitotic chromosomes consist of double-stranded DNA organized into chromatin with histones, including non-coding regions and base sequences.
• Examine each option's three descriptions for accuracy against chromosome structure.
• Verify B matches: non-coding DNA exists, DNA is double-stranded, histones package DNA, and DNA has base sequences.
• Confirm others contain inaccuracies, eliminating them.

Why B is correct:

• Chromosomes contain non-coding DNA regions, double-stranded DNA structure (per Watson-Crick model), histone proteins for nucleosome formation, and DNA sequences of bases defining genetic information.

Why the others are wrong:

• A: Centromere contains DNA (not "no DNA"); DNA is double-stranded, not single polynucleotide; GC-richness is not a defining telomere feature.
• C: All eukaryotic DNA attaches to histones; histones are essential for chromatin structure, not "no role."
• D: Centromere attachment occurs in prometaphase/metaphase, not prophase; chromatids are coding/non-coding, not specified as non-coding.

Final answer: B