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Download Ecology of Bacteria and Virus Cycles Worksheet
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Answer the following questions about bacteria and viruses. Use each of the terms below only once to complete the passage. antibiotics bacteria decomposers disease nitrogen nitrogen fixation normal flora symbiotically vitamin K yogurt Most (1) _________________________ are beneficial. Some bacteria are (2) _________________________ that return vital nutrients to the environment. Certain types of bacteria use (3) _________________________ gas directly and convert this gas into compounds that plants can use. This process is called (4) _________________________ . Some bacteria called (5) _________________________ live in and on the human body. Escherichia coli live (6) _________________________ in the gut of humans and produce (7) _________________________ , which humans need for blood clotting. Many food products, such as cheese and (8) _________________________ , are made with the aid of bacteria. Other bacteria make (9) _________________________ . A small percentage of bacteria can cause (10) _________________________ . Complete the table by checking the correct column(s) for each description. Description 11. Viral genes are expressed immediately after the virus infects the host cell. 12. Many new viruses are assembled. 13. This cycle is preceded by a virus entering a host cell. 14. Viral DNA is integrated into the host cell’s chromosome. 15. Viruses are released from the host cell by lysis or exocytosis. 16. The viral genes can remain dormant for months or years. Lytic Cycle Lysogenic Cycle
