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EXCERCISE 5.1 LAB MICROBIO

front 1 1.What charge do most bacterial stains have? A) Negative B) Positive C) Neutral D) Variable	back 1 B) Positive
front 2 1.What is the purpose of negative stains like Congo red and India ink? A) To stain the bacteria B) To stain the background C) To enhance bacterial growth D) To kill the bacteria	back 2 B) To stain the background
front 3 1.What is the total magnification when using a 10x ocular and a 100x objective? A) 100x B) 400x C) 1000x D) 10,000x	back 3 C) 1000x
front 4 1.At what magnification will you not see individual bacteria? A) 100x B) 200x C) Less than 400x D) More than 1000x	back 4 C) Less than 400x

front 5 1.What is the purpose of immersion oil when using the 100x objective? A) To clean the slide B) To improve resolution C) To magnify the image D) To protect the lens	back 5 B) To improve resolution
front 6 1.What is the function of the condenser in a microscope? A) To magnify the specimen B) To focus light on the specimen C) To adjust the stage D) To change the objective lens	back 6 B) To focus light on the specimen
front 7 1.What does the term "parfocal" mean in microscopy? A) The specimen will be out of focus when changing objectives B) The specimen will almost be in focus when changing objectives C) The light intensity will change when changing objectives D) The magnification will change when changing objectives	back 7 B) The specimen will almost be in focus when changing objectives
front 8 1.How are Staphylococcus bacteria arranged? A) Chains B) Pairs C) Clusters of spherical bacteria D) Single cells	back 8 C) Clusters of spherical bacteria

front 9 1.What is the function of immersion oil in microscopy? A) To clean the slide B) To improve resolution by matching the refractive index of glass C) To magnify the image D) To protect the lens	back 9 B) To improve resolution by matching the refractive index of glass
front 10 1.What is the function of the condenser in a microscope? A) To magnify the specimen B) To focus light on the specimen C) To adjust the stage D) To change the objective lens	back 10 B) To focus light on the specimen
front 11 1.What is the function of the iris diaphragm in a microscope? A) To magnify the specimen B) To control the amount of light passing through the condenser C) To adjust the stage D) To change the objective lens	back 11 B) To control the amount of light passing through the condenser
front 12 1.Why do you initially focus on the wax pencil mark instead of the stain? A) To see the bacteria more clearly B) To ensure the slide is in the correct position C) To adjust the light intensity D) To clean the slide	back 12 B) To ensure the slide is in the correct position

front 13 1.What does the name Streptococcus refer to? A) Rod-shaped bacteria B) Chains of spherical bacteria C) Clusters of spherical bacteria D) Single spherical bacteria	back 13 B) Chains of spherical bacteria
front 14 1.Where do you discard used slides in the lab? A) In the regular trash B) In a designated sharps container C) In the sink D) In a recycling bin	back 14 B) In a designated sharps container