A) True B) False 13. Most microorganisms cause disease in humans. B) False 14. L

Question

A) True B) False 13. Most microorganisms cause disease in humans. B) False 14. Light of 15. When light bends as it passes through an object 16. Electron microscopes have a much better resolving power when compared to light microscopes wavelength typically will result in A) longer, better B) shorter, better C) any, poor D) shorter, worse of the light has occurred. D) refraction A) reflection B absorption Because: A) electrons are invisible to the eye B) electrons have longer wavelengths than visible light rays C) electrons have shorter wavelengths than visible light rays D) electrons are negatively charged 17. During microscopic observation of a specimen, the amount of light that is allowed to pass through the specimen is controlled by the: A) condenser B) objective lens C) iris diaphragm D) ocular lens 18. The lens closest to your eyes during a microscopic examination is B) objective A) ocular C) condenser D) compound 19. Most light microscopes contain a that converges (concentrates) the light beam so that it passes through the specimen: A) objective lens B) iris diaphragm C) mechanical stage D) condenser A)bright field B)dark field C)phase-contrast D)Normanski being seen against a dark background is a 20. A microscope in which light rays pass directly through a specimen is a 21. A microscope in which light rays are reflected off of the specimen and which results in a clear image A) bright field B) dark fieldC) phase-coatrast D) Normanski 22. Ultraviolet light is a key component of A) bright-field microscopy C) phase-contrast microscopy B) dark-field microscopy D) fluorescence microscopy 23. Bacterial capsules can best be visualized by simple staining b) False a) True 24. A dark-field microscope produces bright images against a dark background 25. Bacteria which show a wide variety of shapes within a single species are said to be: 26. Which of the following cellular structures can be found in both prokaryotic and eukaryotic cells? a) True b) False A) pleomorphic B) axenic C) aceularD) monomorphic A) Golgi apparatus B) lysosomesC) perotisomes D) rbosomes

Explanation / Answer

13. The statement that most microorganisms cause disease in humans is a false one. Thus option B is the right answer.

This is a false statement because only 1% of the microorganisms are harmful or cause disease in the humans. Rest are good microbes.

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