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Microbiology Lab 1

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Module 1 Experiment 1:
Observing Bacteria and Blood (No microscope needed for this lab)

List the following parts of a microscope and briefly describe each part. * Eyepiece Lens: To transmit and magnify the image from the objective lens to your eye * Body Tube: To hold the eyepiece at the proper distance from the objective lens and blocks out stray light * Nosepiece: A rotating mount that holds many objective lenses * Objective Lens: To gather light from the specimen * Stage: This is the flat surface on which the slides are placed on. It can be moved up and down for focusing. * Diaphragm: Placed in the light path to alter the amount of light that reaches the condenser. Varying the amount of light alters the contrast in the image * Mirror: A mirror is an alternative to an electrical lamp for illuminating light to the slide. * Coarse Adjustment Knob: To bring the object into the focal plane of the objective lens * Fine Adjustment Knob: To make fine adjustments to focus the image * Arm: A curved portion that holds all of the optical parts at a fixed distance and aligns them * Stage Clips: to hold the specimen still on the stage. Because you are looking at a magnified image, even the smallest movements of the specimen can move parts of the image out of your field of view * Stage: Where the specimen rests
Define the following microscopy terms: * Focus: Is the image blurry or well-defined? Focus is related to focal length and can be controlled with the focus knobs. The thickness of the cover glass on the specimen slide can also affect your ability to focus the image if it is too thick for the objective lens. The correct thickness is usually written on the side of the objective lens. * Resolution: the closest two objects can be before they are no longer detected as separate objects (usually measured in nanometers) * Contrast: What is the difference in lighting between adjacent areas of the specimen? Contrast is related to the illumination system and can be adjusted by changing the intensity of the light and the diaphragm/pinhole aperture.
You do not need to prepare a fresh yogurt slide for this lab, but you need to observe a microscopic image of a fresh yogurt. You can use a microscopic image in your textbook, or in your lab manual or you can search online for microscopic images of yogurt.
Are there observable differences between fresh yogurts under the microscope and the prepared yogurt slide? If so briefly describe them.
What are the four bacteria shapes: * Cocci: Are spherical shaped * Bacillus: Are rod shaped * Spiral: Are helical or spiral shaped * Vibrio: Are comma shaped
Bacteria occur in several common arrangements with each other. What are the arrangements? * Cocci: Occurs as a single sphere. * Diplococci: Occurs as paired spheres. * Streptococci: Spheres linked in chains * Staphylococci: Spheres grouped in clusters * Bacillus: Occurs as a single rod * Diplobacillus: Occurs as paired rods * Streptobacillus: Rods are linked in chains
Can you identify specific bacteria morphologies on either the fresh or prepared yogurt slides? If so, which types? * Coccus: These are spherical bodies in plenty * Bacillus just a few
Observe the mages of a blood smear. Describe the cells you were able to see in the blood smear. (You can use the images we provided or images in your textbook or lab manual, or you can search online for blood smear images by entering microscopic images of blood into your search engine.) 1. Red blood these are the red spherical bodies evenly distributed throughout the slide they carry oxygen to other cells. 2. Lymphocytes this is a purple like body centrally located and surrounded by a sea of red blood cells. 3. Neutrophil are fuzzy purple cells located near the right hand corner of the slide 4. Monocytes this is a fuzzy purple body located at the bottom half of the slide. 5. Basophile is a blue stained body located in the middle of the field. 6. A few fuzzy blue platelets provide protection against bleeding.
Are the cells you observed in an image of blood smear different than the bacteria cells you observed? How do they differ? (Hint bacteria cells are prokaryotic. All other cells including blood cells are eukaryotic. This is important difference when it comes to using antibiotics to treat various diseases.
What are some of the differences between prokaryotes and eukaryotic cells? 1. Eukaryotic cells have a true nucleus, bound by a double membrane. Prokaryotic cells have no nucleus. 2. Eukaryotic DNA is linear; prokaryotic DNA is circular (it has no ends). 3. Eukaryotic DNA is complex with proteins called "histones," and is organized into chromosomes; prokaryotic DNA is "naked 4. Both cell types have many, many ribosomes, but the ribosomes of the eukaryotic cells are larger and more complex than those of the prokaryotic cell. 5. The cytoplasm of eukaryotic cells is filled with a large, complex collection of organelles, many of them enclosed in their own membranes; the prokaryotic cell contains no membrane-bound organelles which are independent of the plasma membrane.
What is the purpose of immersion oil that is used with the 100* objective lens?
Special oil used in microscopy. A drop is placed upon the cover slip and the objective is lowered until it just touches the drop. Once brought into focus, the oil acts as a bridge between the glass slide and the glass in the lens. This concentrates the light path and increasing the resolution of the image

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