Revision questions 1.6. Cell division Understandings, Applications and Skills Understandings: • Mitosis is division of the nucleus into two genetically identical daughter nuclei. • Chromosomes condense by supercoiling during mitosis. • Cytokinesis occurs after mitosis and is different in plant and animal cells. • Interphase is a very active phase of the cell cycle with many processes occurring in the nucleus and cytoplasm. • Cyclins are involved in the control of the cell cycle. • Mutagens, oncogenes and metastasis are involved in the development of primary and secondary tumours. Applications and skills: • Application: The correlation between smoking and incidence of cancers. • Skill: Identification of phases of mitosis in cells viewed with a microscope or in a micrograph. • Skill: Determination of a mitotic index from a micrograph. Dr. Miltiadis Kitsos, DP Biology, Platon School, mailto:[email protected]; http ://www.stepsinbiology.com
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Revision questions on 1.6. Cell division of IB Biology
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Revision questions 1.6. Cell division
Understandings, Applications and Skills
Understandings:• Mitosis is division of the nucleus into two genetically identical
daughter nuclei.• Chromosomes condense by supercoiling during mitosis.• Cytokinesis occurs after mitosis and is different in plant and animal
cells.• Interphase is a very active phase of the cell cycle with many
processes occurring in the nucleus and cytoplasm.• Cyclins are involved in the control of the cell cycle.• Mutagens, oncogenes and metastasis are involved in the development
of primary and secondary tumours.
Applications and skills:• Application: The correlation between smoking and incidence of
cancers.• Skill: Identification of phases of mitosis in cells viewed with a
microscope or in a micrograph.• Skill: Determination of a mitotic index from a micrograph.
2. Outline the purpose of mitosis in eukaryotes. ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
3. Distinguish between cell division in prokaryotes and mitosis in eukaryotes.………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
5. Outline the main events happening during interphase. ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
6. Label and annotate the following structures
7. Outline how DNA supercoils into chromosomes and explain why this supercoiling is essential during mitosis.
8. Draw and label a pie chart to show the relative amount of time spent in each phase of the cell cycle, including the stages of interphase and mitosis, as well as cytokinesis.
9. Sketch and outline the stages of mitosis of an animal cell with a chromosome number of four.
10. In the micrograph given below we may see meristem cells in onion roots undergoing mitosis. Indicate at least one cell in prophase, metaphase, anaphase and telophase.
14. Describe cytokinesis in animal cells.…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
15. Distinguish cytokinesis in plant and animal cells. ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
16. The following diagrams outline the steps of cytokinesis in plant cells. Annotate this diagrams in order to outline the process of cytokinesis in plant cells.
17. Explain the role of cyclins in mitosis ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
18. Define the following terms (a) benign tumour (b) malignant tumour (c) cancer (d) carcinogen (d) mutagen (e) proto-oncogene and (f) Tumour-suppressor genes.
19. A study was carried out into the number of cigarettes smoked by men per year and the number of deaths from lung cancer. The graph below shows the results of this study.
EDEXCEL Biology AS Paper 1 January 2009 http ://qualifications.pearson.com/en/support/support-topics/exams/past- papers.html
(a) Describe the changes in the number of deaths from lung cancer and number of cigarette smoked between 1920 and 1975.
(b) Explain the meaning of the term correlation.
(c) Does correlation mean causality?
(c) Describe the evidence shown in this graph that suggests there is a correlation between cigarette smoking and the number of deaths from lung cancer.
(d) Give two additional pieces of information that would increase the validity of any conclusions made from this study.