Commensalism may involve obtention of food (for example, the innocuous bacteria of the human guts), shelter or support (epiphytes on trees) and transportation (pollen carried by insects or birds). The commensalism that involves obtention of shelter is also called inquilinism.
In a compound microscope, the primary image is formed by an objective lens and enlarged by the optical lens to reveal a virtual image. A) True B) False
"Parfocal" refers to microscopes with multiple objectives where A) objectives are used in pairs for stereoscopic effects. B) each objective has the same working distance above the specimen. C) each objective is positioned to be in focus at the same stage height. D) sequential objectives increase power by a factor of two.
Which of the following is NOT equivalent to 10 micrometers. A) 0.0001 cm B) 0.01 mm C) 10,000 nm D) 100,000 Angstroms
Phase Contrast microscopy A) Continuously changes the phase of the incident light from the condenser to improve contrast in the specimen. B) Uses circular filters in the condenser and objective to give contrast to parts of the cell with different refractive indices. C) Uses special lenses to distinguish between solid and liquid phases of the cell. D) Uses special lenses to change the color of light passing through them
Which of the following statements about Transmission Electron Microscopy is not true. A) The specimen must be stained with osmium or other heavy metal. B) The specimens are placed in a high vacuum for viewing. C) The specimens must be sliced very thin, 20-100 nm in thickness. D) The beam is focused by electromagnetic lenses
Which of the following statements is most correct about Atomic Force Microscopy (AFM)? A) AFM can visualize protein bound to DNA molecules. B) AFM can visualize unfixed specimens in water or buffer. C) AFM moves a very sharp tip over the surface of the specimen to "feel" its shape. D) All the statements above are true
Which of the following statements is most correct about the differential Gram stain? A) Crystal violet differentially stains Gram positive cells. B) Gram's iodine differentially stains Gram positive cells. C) Acetone differentially destains Gram negative cells. D) Saffron red differentially stains Gram negative cells
Which of the following objectives would give you the best resolution of small objects? A) 10x air, N.A. 0.25 B) 40x air, N.A. 0.65 C) 64x oil, N.A. 1.4 D) 100x oil, N.A. 1.25
Transmission electron microscopy is best for high magnification viewing of A) internal structure of fixed cells. B) internal structure of live, motile cells. C) surface structure of fixed cells. D) surface membranes of live, motile cells
Monochromatic (one color) light is sometimes used to increase the resolution of light microscopes. Light of which color below would give you the best resolution? A) Red B) Orange C) Green D) Blue
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