Microbiology Quiz 2 (Chapter 2 & 3)

scanning

*A _____________________ electron microscope produces a three dimensional view of a specimen by measuring electrons knocked out of the surface of the specimen.*

transmission

*A _____________________ electron microscope sends a beam of electrons through a ultra-thin section of the specimen.*

True

*A darkfield microscope blocks out any light that is not reflected by the specimen.* A. True B. False

True

*A differential interference contrast microscope uses two beams of light.* A. True B. False

10^-9 m

*A nanometer is:* A. 10^-3 m B. 10^-6 m C. 10^-9 m D. 10^-12 m

False

*A phase-contrast microscope blocks out any light that is not reflected by the specimen.* A. True B. False

False

*Bright field microscopy can be used to see DNA.* A. True B. False

True

*In darkfield microscopy, the sample is light and the background is dark.* A. True B. False

False

*Most viruses can be seen with a compound light microscope.* A. True B. False

True

*Scanning tunneling microscopy can be used to see DNA.* A. True B. False

ocular

*The ____________________ lens is the lens contained in the microscope eyepiece.*

objective

*The ____________________ lens is the lens of a microscope closest to the specimen.*

True

*The lamp of a fluorescence microscope emits light that is not visible to the eye.* A. True B. False

Decreases refraction

*What is the purpose of adding immersion oil?* A. Increases magnification B. Increases refraction C. Decreases magnification D. Decreases refraction

Phase contrast

*Which of the microscopes would be best for visualizing an unstained, unpigmented sample?* A. Light B. Fluorescence C. Phase contrast