Compare and contrast the light microscope with the electron microscope
What will be an ideal response?
Both the light microscope and the electron microscope depend on the wavelength of radiation to achieve the resolution necessary to see fine details of specimens. Light microscopes use light rays, which, because of their relatively long wavelengths, limit the magnification of these microscopes to 2000× or less. Electron beams, by contrast, have such a short wavelength that the resolution is greatly increased, to the point that magnification of 100,000× or more is possible. Both microscopes are capable of modulating and focusing their radiation sources in such a way as to increase the quality of the magnification; however, in a light microscope the light rays are focused using glass lenses, whereas in an electron microscope the electron beam is focused with magnetic fields. Because of their higher levels of magnification and extreme resolving power, electron microscopes are capable of revealing the finest details of the cell's ultrastructure, even molecules and atoms; light microscopes are capable of revealing only the larger cellular structures, such as organelles.
Bloom's Taxonomy: Analysis
Section: Microscopy
Learning Outcome: 4.9, 4.11
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When there is the same amount of things inside of the cell compared to what's outside of the cell it is called what?
What will be an ideal response?
Smooth muscle has all of the following characteristics except:a
being attached to bones via tendons. b. having sustained contractions. c. requiring less ATP to maintain a high level of force. d. contracting slowly. e. having muscle fibers capable of greater shortening than striated muscle.
Bacteria reproduce asexually via binary fission. This process generates ________
A) Genetically different bacteria B) Genetically identical bacteria
The finding that MSH (melanocyte-stimulating hormone) causes frog skin cells to darken when added to the interstitial fluid but has no effect on color when injected into the cells supports which of the following ideas?
a. MSH is a tropic hormone. b. MSH is a neurohormone. c. MSH binds to cell surface receptors. d. MSH is a steroid hormone. e. MSH is a steroid hormone and binds to cell surface receptors.