Table 1: Assay Results
Filter Paper Section
Colony
Color Change?
Oxidase Positive or
Negative?
Exp. 1 skin
1
yellow to purple Purple
Positive
Exp. 2 shoes
1
Orange to yellow
negative
Exp. 3 phone
1
Yellow to purple
positive
Control
1
No color change
n/a
Insert pictures of your plates after incubation, and the results of the âDrySlideâ for each of the plates below.
Post-Lab Questions:
Which bacterial plates contained oxidase positive bacteria? Which plates contained oxidase negative bacteria? Did both of the colonies from each plate show the same color change? Why or why not? How would you interpret this?
Which bacterial samples have cytochrome c oxidase as the terminal enzyme of their ETC? Which bacterial samples do not have cytochrome c oxidase as the terminal enzyme of their ETC?
3. Is the control test in this experiment positive or negative control? What is the purpose of a negative control?
4. What is the purpose of a positive control?
5. How are mitochondria in eukaryotic cells similar to bacteria that use aerobic respiration?
Table 1: Assay Results | |||
Filter Paper Section | Colony | Color Change? | Oxidase Positive or |
Exp. 1 skin | 1 | yellow to purple Purple | Positive |
Exp. 2 shoes | 1 | Orange to yellow | negative |
Exp. 3 phone | 1 | Yellow to purple | positive |
Control | 1 | No color change | n/a |
Insert pictures of your plates after incubation, and the results of the âDrySlideâ for each of the plates below.
Post-Lab Questions:
Which bacterial plates contained oxidase positive bacteria? Which plates contained oxidase negative bacteria? Did both of the colonies from each plate show the same color change? Why or why not? How would you interpret this?
Which bacterial samples have cytochrome c oxidase as the terminal enzyme of their ETC? Which bacterial samples do not have cytochrome c oxidase as the terminal enzyme of their ETC?
3. Is the control test in this experiment positive or negative control? What is the purpose of a negative control?
4. What is the purpose of a positive control?
5. How are mitochondria in eukaryotic cells similar to bacteria that use aerobic respiration?
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