3.6.2 Scanning and Transmission Electron Microscopes

Light microscopes can magnify up to __________ times the original size with good resolution but electron microscopes can magnify __________ times with good resolution.

1,000; 1,000,000

How do the images generated by a transmission electron microscope and a scanning electron microscope differ? A) A scanning electron microscope passes a beam of electrons directly through a specimen. B) A transmission electron microscope passes a beam of electrons directly through a specimen. C) Scanning electron microscopy involves the use of vacuum pumps. D) In transmission electron microscopy, surface features of an organelle can be imaged.

B

As a graduate student, you are required to take detailed pictures of the progressive stages of DNA coiling. You should probably use a A) light microscope because of the resolving power at the required magnification. B) fluorescence microscope so that you can use living cells. C) transmission electron microscope because of its resolving power. D) scanning electron microscope to reveal the surface details of the nuclear envelope.

C

Pictures taken by a scanning electron microscope can be viewed by

fluorescent screen

If you would like to examine the surface features of a ribosome, you should probably use what kind of microscope

scanning electron