The photomicrograph shows cells undergoing mitosis. Which statement describes what will happen next in cell $$$X$$$ ?

Chromatin coils up tightly and the nuclear envelope breaks down.

Chromosomes line up along the equator of the cell and attach to the spindle.

Sister chromatids move towards opposite poles, pulled by the spindle fibres.

Spindle fibres break down and the cell prepares for cytokinesis.

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w24_qp_12 Year：2024 Question No：19

Answer:

5.1.1.1 DNA

5.1.1.2 histone proteins

5.1.1.3 sister chromatids

5.1.1.4 centromere

5.1.1.5 telomeres

5.1.2.1 growth of multicellular organisms

5.1.2.2 replacement of damaged or dead cells

5.1.2.3 repair of tissues by cell replacement

5.1.2.4 asexual reproduction

5.1.3.1 interphase (growth in G1 and G2 phases and DNA replication in S phase)

5.1.3.2 mitosis

5.1.3.3 cytokinesis

5.1.4 outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication

5.1.5 outline the role of stem cells in cell replacement and tissue repair by mitosis

5.1.6 explain how uncontrolled cell division can result in the formation of a tumour