Since the numeric pyramid represents the quantity of individuals in each trophic level of the food chain, inferior tropic levels with fewer individuals than the superior tropic levels may exist. For example, a single tree can serve as food to millions of insects.
Objective lenses with higher magnification generally have a shorter working distance. A) True B) False
The fluorescence microscope has become an essential tool in medical microbiology to identify bacterial pathogens. A) True B) False
Microscope resolution increases as the wavelength of radiation used to illuminate the specimen decreases. A) True B) False
Even on the best light microscopes, increasing total magnification beyond 1500 cannot result in better resolution of the image. A) True B) False
Differential Interference Contrast microscopy A) compares two identical specimens on the same microscope. B) illuminates the specimen with light of two different colors. C) illuminates the specimen with light of two different phases. D) illuminates the specimen with both reflected and transmitted light
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
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