Which one of the following structures will you likely NOT see in an unstained cell?
a. chromosome
b. cell wall
c. nucleus
d. nuclear envelope
True or False: A compound light microscope can be used for electron (scanning or transmission) microscopy.
A. Chromosomes
Chromosomes are the thin thread-like structures that are visible in dividing cells only. They are made up of chromatin and packing proteins. They are seen in a stained cell only. Chromosomes are stained with colored dyes to make them visible.
Nucleus, nuclear membrane and cell walls are visible without staining also.
Which one of the following structures will you likely NOT see in an unstained cell? a....
Immunocytochemistry is the method of visualization of proteins in cells with the use of antibody that recognize specific molecules. Recently the visualization of these antibody-bound molecules is realized with the imaging of fluorescently-labeled antibodies against these receptors. Which type of microscopy would be used for this study? 0. Confocal microscopy O. Phase-contrast microscopy O. Differential interference contrast microscopy Electron phase-contrast microscopy You are working on a project that involves an imaging of rough endoplasmic reticulum shown here. What microscope was...
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1. Fill out the following table by indicating which general technique (light microscopy (LM) or electron microscopy (EM]) could be used to observe each structure or phenomenon. Put "no" in the box if the technique could not be used. If light microscopy can be used, name one technique (bright-field, phase-contrast, fluorescence, etc.) that you think would be effective. You will find some useful information in Appendix 1 of this manual and Chapter 18 of your textbook. Structure or phenomenon Could...
A. 1. Which step in preparing tissue for histological study is the preservation step that preserves the tissue from decay? A. Fixation B. Embedding in wax or plastic C. Dehydration D. Sectioning (slicing) E. Staining D. 2. Which of these body structures lies the farthest ventrally? A. ankle B. neural tube in an embryo C. triceps brachii muscle D. umbilicus (navel) E. sacrum B. 3. Light microscopy (LM) versus electron microscopy (EM): Circle the correct statement. A. LM gives sharper...
Help S Required information Based on the image above and your knowledge of microscopes, decide which type of microscope is best for each of the followin applications. Compound Light Microscope structures found within plant cells hat circulate around the cytoplasm of the cell through a process caled cytoplasmic streaming. What type of microsoope would be best to view this in real time? Transmission Electron Microscope (TEM) The flu virus contains intrastructural details that relate to its pathogenicity What type of...
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What type of microscope (see below) would you use to greatly magnify a tiny 3-D structure? Why? Bright field, dark field, phase contrast, differential-interference, fluorescence, conofocal, transmission electron, or scanning electron
It is not possible to see very small objects, such as viruses, using an ordinary light microscope. An electron microscope, however, can view such objects using an electron bean instead of a light beam. Electron microscopy has proved invaluable for investigations of viruses, cell membranes and sub-cellular structures, bacterial surfaces, visual receptors, chloroplasts, and the contractile properties of muscles. The “lenses” of an electron microscope consist of electric and magnetic fields that control the electron beam. As an example of...
Which of the following is NOT a specific target of antimicrobials and antibiotics? A)Cell wall B)Cell membrane C)Nucleus D)Ribosomes True or False. There are perfect drugs. False True
You purified fragments of nuclear envelope from human fibroblasts by biochemical fractionation. You first decide to use electron microscopy to test for the presence of the nuclear lamina on these envelope fragments. Which of the following structures would suggest the presence of the nuclear lamina? A. Large pores that span through both nuclear membranes B. An organized meshwork of ~ 10 nm fibers C. "Little bumps", presumably membrane proteins, at the surface of the inner membrane D. Two phospholipids bilayers...