BIOLOGY 102L PRACTICE QUESTIONS
#18- BACTERIA
The following practice test has been prepared for you to get a general idea of what types of questions you might be expected to answer on your final laboratory exam. The questions included here are probably easier and more general than ones you might see on your actual exam. Only a few questions from each lab exercise have been included.
To take this practice test, write the correct answers to each question on some scrap paper. Then, at the end of the test, you will find the answers. If you miss a few and are unsure why, check with your lab instructor BEFORE you take your lab exam.

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Observe the following image which illustrates the three different types of baceria. Can you identify the different shapes?
Since all of the cells appear purple in color, are thay Gram + or - ?
Look closely and you should be able to spheres (cocci), rods (bacilli), and spirals (spirilli).
Gram +. They would appear red if they were Gram -.


Consider the following sensitivity plate which was setup similar to the ones you observed in lab.



A = ampicillin
B = bacitracyn
C = control
D = dish soap

Based on these results, which compound appears to be most effective at preventing bacterial growth? Bacitracyn
Would you expect all types of bacteria to be equally sensitive?
Not likely. Some bacterial species might be susceptible to certain antibiotics while others are not.
Try to identify the following cyanobacteria that were observed in lab.


Oscillatoria


Nostoc


Gleocapsa

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