Choose the BEST answer for each question and click on the button (circle) in front of that answer. If you answer ALL the questions, you can see your score when you are finished, as well as the correct answers.

1. The image shown here is rabbit plasma that was inoculated with a bacterial culture and incubated. This result is a ________ test.

	positive catalase negative catalase positive coagulase negative coagulase positive hemolysis

2. The organism that produced the result shown at the arrow in question 1 is most likely

1. Staphylococcus aureus
2. Staphylococcus epidermidis
3. Streptococcus pyogenes
4. Streptococcus pneumoniae
5. Streptococcus mitis

3. The Kirby-Bauer test is used to determine

1. which carbohydrates a bacteria can ferment.
2. if the bacteria can produce gelatinase.
3. if the organism can produce catalase.
4. which antibiotics a bacteria is susceptible to.
5. the type of hemolysis a bacteria is capable of producing.

4. A different bacterial culture was placed into each circle on the slide shown here. Hydrogen peroxide was then added to each circle. The arrow in this image indicates an organism that is capable of

	degrading gelatin. being resistant to penicillin. being sensitive to bacitracin. clotting plasma. degrading hydrogen peroxide.

5. This image shows the results of blood typing for Ms. Smiggle. The circle on the left contains her blood plus anti-A antiserum. The circle on the right contains her blood plus anti-B antiserum. Apparently Ms. Smiggle has blood type

	A. B. AB. O. all of the above.

6. A pure culture of the same test organism was inoculated into all three of the carbohydrate broths shown here and incubated. Tube 1 contains sucrose, tube 2 contains lactose, and tube 3 glucose. Apparently the test organism ferments

	glucose only. lactose only. sucrose only. lactose and glucose only. lactose and sucrose only.

7. The Interpretive Standards say that a zone of inhibition of 20 mm. qualifies as a sensitive zone for a newly discovered antibiotic. A zone of inhibition of 17 to 19 mm. qualifies as intermediate. If a test bacteria exhibits a 15 mm. zone of inhibition when properly tested against this newly discovered antibiotic on Mueller-Hinton agar, the test organism is expected to

1. grow in the presence of the antibiotic.
2. die in the presence of the antibiotic.
3. unable to predict results from the data given

8. Bacitracin sensitivity is used to distinguish

1. Streptococcus pneumoniae from other alpha-hemolytic streptococci.
2. Staphylococcus aureus from Staphylococcus epidermidis.
3. Staphylococcus from Micrococcus.
4. Group A Streptococcus from other beta-hemolytic streptococci.
5. Group A Streptococcus from Streptococcus pneumoniae.

9. Sensitivity to bacitracin would best be determined by growing the test organism on

1. eosin methylene blue agar.
2. carbohydrate fermentation broth.
3. blood agar.
4. MacConkey agar.
5. All of the above media would be equally suitable.

10. If the "O" on the disks in this image stands for optochin, what would you conclude about the organism to which the arrow is directed?

	The organism is most likely to be Staphylococcus aureus. The organism is most likely to be Streptococcus pyogenes (Group A Strep). disease The organism is most likely to be Streptococcus pneumoniae. The organism is most likely not Streptococcus pyogenes (Group A). The organism is most likely not Streptococcus pneumoniae.