General Microbiology MCQs with Answer Keys (1-10)

1. **If a scientist actively researches the frequency and distribution of the diseases, he is said to be a:**a. Mycologistb. Immunologist            c. Etiologistd. Epidemiologiste. Ecologist
2. **The biggest obstacle in the acceptance and development of the science of microbiology was:**a. Lack of effective vaccinesb. Lack of sterile containersc. Theory of spontaneous generationd. Absence of debilitating diseases before the seventeenth-century    e. Use of aseptic technique
3. **The germ theory of disease states that:**a. Microorganisms that invade other organisms can cause disease in those organismsb. Microorganisms can spontaneously arise in debilitated hostsc. Microorganisms don’t cause infectious diseasesd. Not all microorganisms are harmfule. All microorganisms are beneficial to humans in one way or another
4. **When determining distances and sizes, the smallest unit of measurement is the:**a. Millimeterb. Micrometer       c. Centimeterd. Decimetere. Nanometer
5. **The average wavelength of light visible to our eye is:**a. 800 nm         b. 200 nm         c. 550 nmd. 100 nm       e. 420 nm
6. **In a light microscope, what function does the condenser serve?**a. Focuses the light rays onto our eyesb. Magnifies the light rays after their passage through the samplec. Focuses the light rays on sampled. Increases the light intensitye. Reduces glare
7. **The total magnification of a microscope is calculated by:**a. Addition of the objective lens and ocular lens magnification powersb. Multiplication of the objective lens and ocular lens magnification powersc. Multiplication of the objective lens and condenser lens magnification powersd. The objective lens power squarede. None of the above
8. **Which stains are frequently used to identify mycobacterium and other bacteria whose cell walls contain high amounts of lipids?**a. Gram stainb. Schaeffer-Fulton stain           c. Acid-fast staind.Giemsa Staine. Spore stain
9. **Which of the following microscopic techniques provide three-dimensional images of a bacterial cell?**a. Transmission Electron Microscopyb. Scanning Electron Microscopyc. Negative staining microscopyd. Dark-field microscopye. Fluorescent microscopy
10. The transmission electron microscope has the greatest resolving power because it uses an electron beam to view the sample instead of a light beam. The electron beam is used becausea. Electrons have longer wavelengths than light wavesb. Electrons do not penetrate the samplec. Light waves are less visibled. Electrons have shorter wavelengths than light wavese. Electrons are less invasive.

Answer Keys

1. d. Epidemiologist
2. c. Theory of spontaneous generation
3. a. Microorganisms that invade other organisms can cause disease in those organisms
4. e. Nanometer
5. c. 550 nm
6. c. Focuses the light rays on sample
7. b. Multiplication of the objective lens and ocular lens magnification powers
8. c. Acid-fast stain
9. b. Scanning Electron Microscopy
10. d. Electrons have shorter wavelengths than light waves

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