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Name Class Date Chapter 20 Review: Bacteria, Viruses & Disease Use the clues and words to help you write the vocabulary terms from the chapter in the blanks. You may use a word once, more than once, or not at all. retrovirus spirillium vaccine antibiotic 1. An example of a spiral-shaped bacterium is 2. A bacteriophage . is a virus that copies its genetic material from RNA to DNA. 3. A drug that blocks the growth of a bacterial disease is an . Answer the following questions. 4. Unicellular organisms that have no nucleus are called . 5. Complete the compare/contrast table showing the differences between viruses and bacteria. Characteristic Virus Bacteria Structure Reproduction Genetic code Locomotion Nourishment 6. What do we call microorganisms that cause disease? __________________________ 7. Write the names of the three shapes of bacteria in the top row in the table to the right. Then, draw each shape below its name. 8. Why do some scientists think that viruses are not alive? Name at least two reasons. a. _______________________________________________________________ b. _______________________________________________________________ 9. What are the two main parts that every virus has? 10. Label each line on the virus to the right. 11. Name the two kingdoms that bacteria are found in. a. _____________________________________ b. _____________________________________ 12. What type of cells do bacteria have? 13. Label the lined parts of the bacteria to the right. 14. What is it called when two bacteria exchange pieces of their DNA? 15. What do bacteria do when there isn’t enough food and water around them? 16. Describe three methods of controlling the spread of bacteria and viruses. a. _______________________________________________________________ b. _______________________________________________________________ c. _______________________________________________________________ 17. What is antibiotic resistance? How can it be stopped? 18. Describe the best method for washing your hands.