Reference no: EM132831063
Worksheet: Bacteria
A) Web site name: Cells Alive
Look at the diagram of a bacterial cell and click on the labels to get details.
1). What does the Nucleoid contain? __________________________________
2). Are there more "ribosomes" or "flagellum" shown in the diagram? _______ Click on "Cell wall"
3). What is the function of the capsule? ________________________________
4). What is the genophore ? _________________________________________
5). What does the plasmid contain the code for? ________________________
6). What is the function of pili? ___________________________________
Click on "Return to bacteria overview", "Contents", "Microbiology", and then "Dividing Bacteria"
7). How do bacteria reproduce?
8). Why is the earth not covered with bacteria?
9). What happens in the "lag" phase?
Click on "Contents", "Microbiology", and then "Parasites"
10). Why is Cryptosporidium increasingly important? _________________
11). What diseases can Entamoeba cause?
12). There is a rapid influx of ________________ into a contacted cell.
13). Which animal carries Giardia? ______________________________
14). What are the two "eyes" on Giardia? _____________________________
B) Web site name: FSCJ
15). Can most bacteria cause disease? ________________
16). Give an example of a bacterium that cannot live outside human cells: ____________________________
17) What is "colonisation resistance"?
18). What problems can be caused by taking antibiotics?
19). What vitamin is produced by bacteria in the gut? ______________________
20). Why is the stomach usually sterile? ________________________________
21). What are three bacteria found in the small bowel (small intestine)?
22). Where is E. coli usually found? ___________________________________
23). Who is often infected with Staph. aureus? ___________________________
24). Where are spirochaetes found? ____________________________________
C) Web site name: University of Kansas
25). What does the "E." in E. coli stand for ? ____________________________
26). How much of the bacteria in an adult's intestine is E. coli? ___________ %
27). When was Escherichia first isolated and characterized? _______________
28). What parts of the body usually do not contain "helpful" bacteria?
29). Which strain of E. coli causes hemorrhaging? ________________________
30). Which toxin does this strain produce? ______________________________
31). What problems, apart from hemorrhaging, does this strain cause to people who are infected with it?
D) Web site name: New Scientist magazine
Read "Antibiotic ban cuts drug resistant bugs"
32). What did the WHO report conclude in August 2003? ____________
33). Why are low doses of antibiotics used in animal feed? _________________
34). Which country is the world's largest exporter of pork? ________________
35). What change was seen in the percentage of Enterococcus that were antibiotic resistant?
Before the ban: _________ % resistant, after the ban ________ % resistant.
36). List any household items that now routinely contain antibiotics, or other anti-bacterial chemicals:
E) Web site name: Centers for Disease Control
37). What serious complications can Chlamydia cause? __________________
38). What is the estimated number of infections annually? __________________
39). How often does CDC recommend testing for Chlamydia in sexually active women aged 25 or younger? ___________________
40). What is the treatment for chlamydia? _____________________
Commercial companies, such as Monsanto, also use bacteria to add genes to crop plants to produce a "transgenic" plant. This is often called "recombinant DNA", because it re-combines DNA from different species.
F) Web site name: Monsanto Inc.
41). What enzymes were needed to help transfer genes between species?
42). What was the first commercial application of recombinant DNA technology?
43). Which bacterium is used by Monsanto for introducing genes into plants?
44). Which crops are hard to grow from single cells? ______________________
45). Roughly what percentage of potato cells accept new genes? __________%
46). What is the difference between traditional plant breeding and plant biotechnology?
47). What is Bacillus thuringiensis ?
48). How does this bacteria kill pests?
49). Why are chemical insecticides rarely used in Africa? __________________
Some people are concerned about the process of moving genes from one species to another ( recombinant DNA or genetic engineering ). The last website looks at some of the potential problems
G) Web site name: San Francisco State University
Click on one of the essays about Genetic engineering.
50). Which essay did you pick?
51). Briefly summarize the essay:
Attachment:- bacteria.rar