HISTOLOGY: PRACTICE 2

SINGLE BEST OPTION SERIES

         INSTRUCTION: SELECT THE SINGLE BEST OPTION

1.         Which of the following is incorrect about myoepithelial cells?
   a.       Along ducts, they are usually arranged longitudinally
   b.      They are connected to each other and to the epithelial cells by gap junctions and desmosomes
   c.       Their cytoplasm contain numerous actin and myosin filaments
   d.      Their function is to contract around the secretory portion of the gland and thus help to propel secretory products towards the exterior
   e.      None of the above
   2.       Which of the following is incorrect about connective tissues?
   a.       During wound healing, fibrocyte revert to fibroblast state with reactivated synthetic activities
   b.      Myofibroblasts are fibroblast which contain increased amounts of actin microfilaments and myosin
   c.       Myofibroblast play a role in wound contraction
   d.      The main cell type involved in wound repair is basophilic leucocyte
   e.      Fibroblast produce growth factors that influence cell growth and differentiation
   3.       The most common fixative used in preparation of tissues for light microscopy is a buffered solution of:
   a.       Boric acid
   b.      Osmium tetroxide
   c.       Formaldehyde
   d.      Glutataraldehyde
   e.      None of the above
   4.       Parts of a light microscope include the following except:
   a.       Light filter
   b.      Fuel chamber
   c.       Mirror and illuminator
   d.      Stage position adjustment
   e.      Focus adjustment knob
   5.       Periodic acid-Schiff reaction is positive with the following cell structures except:
   a.       Glycogen in liver cells
   b.      Glycocalyx
   c.       Basement membrane
   d.      DNA of cells after mild hydrolysis
   e.      None of the above
   6.       Flagella is present in the human body only in:
   a.       Spermatozoa
   b.      Oocytes
   c.       Epididymis
   d.      Mesothelium
   e.      Ovaries
   7.       Which of the following is incorrect about steroid-secreting cells?
   a.       The testes, ovaries and the adrenal glands contain steroid secreting cells
   b.      They are polyhedral or rounded cells with a central nucleus and a cytoplasm that is rich in lipid droplets
   c.       Their cytoplasm contains few smooth endoplasmic reticulum
   d.      Their mitochondria participates in steroidogenesis
   e.      None of the above
   8.       Which of the following is incorrect about macrophages?
   a.       They carry out phagocytosis
   b.      They are monocytes that have moved from the circulation into connective tissues
   c.       They are present in most organs and constitute the mononuclear phagocyte system
   d.      They usually have an oval or kidney-shaped nucleus located eccentrically
   e.      Tissue macrophages do not usually proliferate locally.
   9.       Which of the following is incorrect about tissue histology using electron microscope?
   a.       Double fixation of tissues to be examined is usually done
   b.      Buffered glutaraldehyde may be used
   c.       Osmium tetroxide is necessary to preserve and stain lipids and proteins
   d.      Electron microscope offer low resolution
   e.      None of the above
   10.   Concerning microscopes, which of the following is incorrect?
   a.       The resolving power of a light microscope depends mainly on the quality of its eyepiece lens
   b.      The ability to rotate the direction of vibration of polarized light during light microscopy is called birefringence
   c.       Phase contrast microscopy uses a lens system that produces visible images from transparent objects
   d.      Confocal microscopy allows the localization of any specimen component with much greater precision than in the common light microscope
   e.      In fluorescence microscopy, tissue sections are irradiated with either ultraviolet light or laser
   
   
   
   
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