Matching chromosome structures to their functions

Steps:

• Identify parts: p1 (centromere), p2 (histone), p3 (telomere).
• Identify functions: f1 (holds two chromatids together), f2 (coils DNA), f3 (prevents loss of genes).
• Recall definitions: centromere joins sister chromatids; histones package DNA by coiling it around them; telomeres cap chromosome ends to protect genes.
• Evaluate choices: check which pairs align with these definitions.

Why A is correct:

• Centromere (p1) functions to hold sister chromatids together (f1) during cell division, per chromosome structure basics.

Why the others are wrong:

• B: Histones (p2) package DNA but do not prevent gene loss—that's telomeres (f3).
• C: Telomeres (p3) cap ends but do not coil DNA—that's histones (f2).
• D: Telomeres (p3) protect genes but do not hold chromatids—that's centromere (f1).

Final answer: A