Describe the four scenarios of Griffith's experiment in the 1920s and summarize the main conclusion
What will be an ideal response?
In scenario 1, Griffith infected a mouse with a living encapsulated bacteria and the mouse died. In scenario 2, Griffith infected a mouse with a living nonencapsulated bacteria and the mouse lived. In scenario 3, Griffith infected a mouse with a heat-killed encapsulated bacteria and the mouse lived. In scenario 4, Griffith infected a mouse with a living nonencapsulated bacteria and a heat-killed encapsulated bacteria and the mouse died. Live encapsulated bacteria were found in the mouse's blood. To conclude, the nonencapsulated bacteria were able to take up DNA from the killed encapsulated bacteria via transformation. This changed the nonpathogenic bacteria into the virulent variety. Griffith's experiments demonstrated that environmental DNA could transform bacteria and help pathogens evolve.
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a. multicellular organism b. colonial organism c. contractile vacuole d. algal bloom e. pathogenic life cycle
Foods rich in complex carbohydrates are usually high in
a. cholesterol. b. fiber. c. fats. d. oils. e. resins.
When genes are inserted into lung cells of cystic fibrosis patients, this kind of treatment is referred to as ________.
Fill in the blank(s) with the appropriate word(s).
The endospore stain reveals internal structures within cells of the genera Bacillus and Clostridium
Indicate whether the statement is true or false