Topic 1 - Cell Biology - Topic 1 Cell Biology Soniya Nahata IB Biology(SL 1.1 Introduction to cells Essential idea The evolution of multicellular

Topic 1 - Cell Biology - Topic 1 Cell Biology Soniya Nahata...

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06/10/15 Topic 1: Cell Biology Soniya Nahata IB Biology (SL) 1.1 Introduction to cells Essential idea: The evolution of multicellular organisms allowed cell specialization and cell replacement. Understandings: U1. According to the cell theory, living organisms are composed of cells. U2. Organisms consisting of only one cell carry out all functions of life in that cell. U3. Surface area to volume ratio is important in the limitation of cell size. U4. Multicellular organisms have properties that emerge from the interaction of their cellular components. U5. Specialized tissues can develop by cell differentiation in multicellular organisms. U6. Differentiation involves the expression of some genes and not others in a cell’s genome. U7. The capacity of stem cells to divide and differentiate along different pathways is necessary in embryonic development and also makes stem cells suitable for therapeutic uses. Applications: A1. Questioning the cell theory using atypical examples, including striated muscle, giant algae and aseptate fungal hyphae. A2. Investigation of functions of life in Paramecium and one named photosynthetic unicellular organism. A3. Use of stem cells to treat Stargardt’s disease and one other named condition. A4. Ethics of the therapeutic use of stem cells from specially created embryos, from the umbilical cord blood of a newborn baby and from an adult’s own tissues.

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