Grade 11 Biology (SBI3U) | Fun Learning Quest for Kids

Your cells are constantly dividing, but not all stages are about splitting. During which phase of the cell cycle does your DNA replicate, ensuring that when you heal a cut, the new cells have the exact same genetic instructions as the original?

Imagine you are designing a drug that stops cancer cells from dividing uncontrollably. Your target is the spindle fibers that pull chromosomes apart. Which stage of mitosis would your drug disrupt to most directly prevent the separation of sister chromatids?

Your body's cells use cellular respiration to extract energy from glucose. The process begins in the cytoplasm. What is the primary reason that glycolysis, the first stage, does not require oxygen, while the later stages (Krebs cycle and oxidative phosphorylation) do?