Biology 9700 · AS & A Level · Chromosome behaviour in mitosis

Chromosome behaviour in mitosis — practice question

Which row gives the correct description of the chromosome structures present during mitosis?

  • Acentromere: region of a chromosome with no DNA; chromatid: single DNA polynucleotide with histone proteins; telomere: region of DNA with many cytosine and guanine bases
  • Bcentromere: region of non-coding DNA holding two chromatids together; chromatid: double-stranded DNA molecule with histone proteins; telomere: region of DNA with many short repeated sequences of bases
  • Ccentromere: region of DNA with no histone proteins that allows separation of chromatids during anaphase; chromatid: DNA molecule coiled round histone proteins to form a chain of nucleosomes; telomere: region of DNA with no proteins that protects the end of a chromatid
  • Dcentromere: region that attaches to spindle microtubules and divides during prophase; chromatid: one of two identical DNA molecules that was replicated during interphase; telomere: region of non-coding DNA holding the ends of the chromatids together

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