Chromosome Components by Abundance

Steps:

• Identify chromosome structure: DNA coils around histones to form nucleosomes, which pack into chromatin with one centromere and two telomeres per chromosome.
• Quantify parts: Nucleotides and histones number in millions/billions; nucleosomes in thousands; telomeres total 2; centromere totals 1; DNA molecule totals 1.
• Rank from most to least numerous: Histones exceed telomeres, which exceed centromere.
• Match to options: Select sequence matching decreasing order.

Why C is correct:

• Histones (millions per chromosome in nucleosomes) outnumber telomeres (2 per chromosome) and centromere (1 specialized region per chromosome), per chromatin packaging definition.

Why the others are wrong:

• A: Starts with least (centromere=1) to most (histone=millions), reverse order.
• B: Incomplete list; DNA molecule (1) is fewer than telomere (2), not decreasing.
• D: Ends with most (nucleotide=billions), not decreasing order.

Final answer: C