B2-Cell Division 0.0 / 5 ? BiologyCells, tissues and organsGCSEAQA Created by: Kevin O.Created on: 20-01-20 12:06 How many chromosomes do humans have? 46 (23 pairs) 1 of 15 How do cells divide? By a process called Mitosis. 2 of 15 What is stage one of the cell cycle? Longest stage. When the cell replicates everything inside it and grows bigger. 3 of 15 What is stage two of the cell cycle? Chromosomes are pulled to each end of the dividing cell and the nucleus divides. 4 of 15 What is stage three of the cell cycle? This is the stage where cytoplasm and the cell membrane divide to form two identical cells. 5 of 15 What is mitosis? It is a process that produces two identical cells. 6 of 15 What is differentiation? Differentiation is when stem cells become specialised cells. 7 of 15 Why is differentiation important in living organisms? They replace dead or damaged cells. 8 of 15 How do you clone plants? You clone them by getting a piece of the leaf tissue and in the right conditions they can become unspecialised and go through mitosis many times 9 of 15 Where are stem cells found in the body? Bone marrow or embryos 10 of 15 What is a zygote? A fusion of an egg cell and sperm cell 11 of 15 What is an embryo? A zygote that divides and becomes a hollow ball of cells 12 of 15 How are stem cells useful in medicine? They can be used to kill cancer and can fight paralysis by repairing spinal nerves 13 of 15 What are the problem with embryonic stem cells? They are seen as unethical as they are taken from abortions 14 of 15 What are the advantages of embryonic stem cells and how are they better than adult stem cells? They can specialise into more cells and there are more of them, they also act quicker 15 of 15
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