BIOLOGY IN FOCUS

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PATTERNS <strong>IN</strong> NATURE REVISION QUESTIONS SR Table 1.6 TR 1. (a) Clarify what is meant by a scientifi c theory. (b) Describe how you would go about validating a scientifi c theory. (c) State the cell theory. 2. Before the development of the cell theory, it was commonly believed that living organisms could arise by spontaneous generation. (a) Outline the theory of spontaneous generation. (b) Describe experimental evidence that was used to discount this theory. (c) Explain the role that the invention of the microscope played in the dismissal of the theory of spontaneous generation. 3. Describe the contributions of Robert Hooke and Robert Brown in the development of the cell theory. (Find a reliable way of remembering which ‘Robert’ did what!) 4. Discuss why biologists have continued to use light microscopes since the invention of the electron microscope. 5. Put the following words into order of size, from smallest to largest: organelles, molecules, cells, atoms and organisms. 6. Compare the detail seen with a light microscope in plant and animal cells when viewed under a light microscope. As a guide use the table below. (Copy out a larger version or print it from the Student Resource CD.) Table 1.6 Parts of cells visible under a light microscope Part of cell Plant cell Animal cell Boundary Organelles Cell shape Vacuoles 7. State whether the each of the following photographs was viewed under a light or an electron microscope and whether it shows plant or animal cells. Justify your answers. 98 SAMPLE CHAPTER ONLY
CELLS AND THE CELL THEORY 8. Using the method described for comparative diagrams on page 84, draw a comparative diagram of: (a) light and electron microscopes (b) chloroplast and mitochondria. 9. Identify the two types of nucleic acid found in cells. 10. Analyse the micrograph below and assess whether it shows plant or animal cells. Justify your choice. SR TR Answers to revision questions SAMPLE CHAPTER ONLY 99
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