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Mitosis
National 5 - Unit 2 - Key Area 1 - Mitosis
| Question | Answer |
|---|---|
| Why do multicellular organisms carry out mitosis? | For growth and repair of damaged cells |
| What word describes a cell with 2 matching sets of chromosomes? | Diploid |
| Why is it important that new daughter cells have the same number of chromosomes as the original parent cell? | To maintain the diploid chromosome complement OR to make sure that no genetic information is lost. |
| State the term for a cell with only one set of chromosomes. | Haploid |
| In stage 2 of mitosis, chromosomes replicate to form two identical .. | Chromatids |
| In stage 3 of mitosis, chromosomes line up along which part of the cell? | The equator of the cell |
| In stage 3 of mitosis, what happens to the nucleus membrane? | The nuclear membrane breaks down. |
| Which structures pull chromatids apart to opposite poles? | Spindle fibres |
| State the name of a cell that is unspecialised. | A stem cell |
| What are the two main sources of stem cells? | Embryos and Adult tissues. |
| State the hierarchy that exists in multicellular organisms | Cell -> Tissue -> Organ -> Organ System |
| What is a sperm cells function? | To fertilise the egg |
| What is a sperm cells specialisation? | It has a tail to swim |
| What is a red blood cells function? | To carry oxygen around the body |
| What is a red blood cells specialisation? | It has no nucleus OR contains haemoglobin OR they are biconcave in shape |
| What is a root hair cells function? | To absorb water |
| What is a root hair cells specialisation? | It has a large surface area |
| If the original cell has a diploid chromosome complement of 4, how many chromosomes will a daughter cell have? | 4 (they always have the same number of chromosomes as the original cell) |
| If the original cell has a diploid chromosome complement of 46, how many chromosomes will the daughter cell have? | 46 (they always have the same number of chromosomes as the original cell) |
| Are stem cells specialised or unspecialised? | Unspecialised. |
| State two uses of stem cells. | Growth and Repair |
| If a cell divides by mitosis every 5 minutes, how many cells would be present after 20 minutes? | 16 cells |
| If a cell divides by mitosis every 20 minutes, how many cells would be present after 2 hours? | 64 cells |
| Why is it important to maintain the diploid chromosomes complement? | To ensure no genetic information is lost. |