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5. The mitotic cell cycle
A section of Biology, 9700
Listing 10 of 324 questions
Bone marrow contains stem cells that divide by mitosis to form blood cells. Each time a stem cell divides it forms a replacement stem cell and a cell that develops into a blood cell. shows changes in the mass of DNA in a human stem cell from the bone marrow during three cell cycles. K mass of DNA per cell time L With reference to , state: what happens to bring about the changes in the mass of DNA per cell at K and at L K L how many blood cells are formed from the stem cell in the time shown what happens to the number of chromosomes in the stem cell. Stem cells in bone marrow give rise to phagocytes, B-lymphocytes and T-lymphocytes. Describe how a red blood cell develops from a stem cell. During an immune response, cells divide by mitosis. Describe how mitosis is involved in an immune response. Describe the modes of action of T-lymphocytes during an immune response.
9700_w12_qp_21
THEORY
2012
Paper 2, Variant 1
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Questions Discovered
324