LSUE MICRO LAB EXAM 1 | 100% Correct | Verified | 2024 Version

LSUE MICRO LAB EXAM 1 | 100% Correct | Verified | 2024 Version The limit of resolution of the unaided human eye is ______. - 0.2 mm For the typical light microscope, the limit of resolution is ______. - 0.2 micrometers When carrying a microscope, one hand should be under the _____ of the microscope to support its weight, and one hand should be on the _____ for balance. - base arm As the power of the objective lens increases, the working distance ______. - decreases Condenser adjustments increase _______ without affecting the bulb life. - illumination The _______ lens provides the highest magnification and has the shortest working distance. - oil immersion The coarse focus knob should only be adjusted when using the _______ lens. - low power The coarse and fine focus knobs adjust the distance between ___________. - the stage and the objective lens A microscope that maintains focus when the objective magnification is increased is called _____. - parfocal Which type of specimens is darkfield microscopy preferred over brightfield microscope? - live unstained specimens or thin cells What is best observed using phase-contrast microscopy? - motility of cells What organisms were formerly known as "blue-green algae"? - cyanobacteria Fungi contain _____ in their cell walls whereas plants contain _______. - chitin cellulose refers to fungi that grow as yeast forms in tissue and reproduce by budding, but produce mycelium and sporulation structures when grown in nutrient medium - dimorphic kills the microorganisms, coagulates the protoplasm of the cells, and causes them to adhere to the cell - heat fixation ovoid cells that occur in pair and chains - streptococci cocci that occur in grapelike clusters - staphylococci rods that can occur singly or in chains - bacillus color-bearing groups of stains - chromophores Acidic dyes are _____ charged. - negatively ______ is a basic stain which has a positive charge. - crystal violet Volutin is composed of what? - polyphosphate ovoid cells that have characteristic buds and are much larger than bacteria - yeasts