Module 3 Biod 171 Exam Questions (16 Terms) With Verified Definitions Updated 2024

Assuming a fixed ocular, identify the part of the microscope you would adjust to enhance the magnification of a sample. A. Objective B. Condenser C. Iris diaphragm D. Eye piece {Ans: A. Only the oculars (eyepiece) and the objectives contribute to the magnification of the sample. Since the eyepiece is fixed, only the objectives could be altered.}A researcher is asked to determine which of two vials contains E coli and which contains Salmonella. Knowing both are Gram-Negative while only one of them is capable of fermenting lactose, which type of media would be best suited: A. Growth media B. Differential media C. Selective media D. Selective and Differential media {Ans: B. Differential media distinguishes between two, often related, microbes.}True or False: Staining is often required to image a cell that is adherent and flat (thin). {Ans: True. Adherent, flat and unstained cells are almost invisible due to the limits on both resolution and contrast. Therefore, cell staining is often required to adequately image the sample.}True or False: A nanometeris longer than a micrometer. {Ans: False. A nanometer is 1,000 times smaller than a micrometer.}True or False: A cell that is adherent, flat (thin) and unstained is