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127 Cards in this Set
- Front
- Back
Harris hematoxylin is used on tissue sections to stain: |
nuclei
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Ripening of hematoxylin is a process of:
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oxidation
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The active staining ingredient in ripened hematoxylin solutions is:
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hematein
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The most important step in regressive hematoxylin staining is:
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differentiation in acid-alcohol
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Hematein is formed in Mayer hematoxylin solution by the addition of:
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sodium iodate
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Mordants are used to:
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link tissue constituents more closely to the dye
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During H&E staining, if ammonia is incompletely removed by washing, the result may be:
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poor staining with eosin
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The combination of a dye and a mordant is called:
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dye lake
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Mercuric oxide (or sodium iodate) is used in Harris Hematoxylin to:
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form hematein
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DNA can be demonstrated with:
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the Feulgen reaction
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All of the following are aluminum hematoxylins EXCEPT:
a) Delafield b) Harris c) Mayer d) Weigert |
d) Weigert
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Which of the following hematoxylins is not readily decolorized with acidic solutions?
a) Harris b) Delafield c) Weigert d) Verhoeff |
c) Weigert
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Natural resins are rarely used for mounting sections today because they:
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are inherently acidic
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Which of the following stains requires mounting with aqueous mounting media?
a) Fite b) Oil Red O c) Grocott d) H&E |
b) Oil Red O
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The mordant in Weigert hematoxylin is:
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iron
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Acetic acid is added to Harris hematoxylin to:
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make nuclear staining more specific
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A dye that may be substituted for hematoxylin in routine staining is:
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celestine blue
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Which of the following is a good example of a polychrome stain?
a) alcian blue b) Congo Red c) Giemsa d) Kinyoun |
c) Giemsa
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Which of the following is stained rose by the methyl green-pyronin (MGP) technique?
a) heterochromatin b) DNA c) RNA d) Golgi apparatus |
c) RNA
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The chemical group in dyes that confers the property of color is called a:
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chromophore
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An auxochrome is a/an:
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ionizing group present in dyes
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Which of the following is formed when hematoxylin is subjected to the action of sodium iodate?
a) a dye lake b) hematein c) hematin d) a polychrome |
b) hematein
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Heterochromatin is stained by:
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hematoxylin
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Which of the following techniques is an example of dye absorption?
a) H&E b) methyl green-pyronin c) Feulgen d) oil red O |
d) oil red O
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Most cytoplasmic proteins are:
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acidophilic
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Differentiating in the H&E stain is an example of using:
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a weak acid
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A tissue component that takes up a cationic dye is said to be:
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basophilic
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Into which of the following dye categories does eosin fall?
a) polychromatic b) cationic c) anionic d) amphoteric |
c) anionic
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For the best cytoplasmic staining, the pH of the eosin should be between:
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4.6 to 5.0
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Ethylene glycol functions in Gill hematoxylin solutions to:
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prevent surface scum
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Which of the following hematoxylin solutions will stain the mucin in goblet cells?
a) Gill b) Mayer c) Harris d) Weigert |
a) Gill
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The Feulgen reaction demonstrates:
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DNA only
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The Feulgen reaction is unsatisfactory on tissue fixed in:
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Bouin solution
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Romanowsky-type stains are combinations of:
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one acid and one basic dye
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Nuclear staining is made more selective by adding which of the following to hematoxylin solutions?
a) sodium citrate b) chloral hydrate c) ethylene glycol d) acetic acid |
d) acetic acid
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Hematoxylin is converted to a dye lake in the Mayer formula by adding which of the following to the solution?
a) sodium iodate b) citric acid c) ammonium aluminum sulfate d) chloral hydrate |
c) ammonium aluminum sulfate
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A large quantity of Delafield hematoxylin stock solution must be maintained because of:
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slow hematein formation
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To link hematoxylin to tissue DNA, which of the following must be added?
a) acid b) oxidizer c) stabilizer d) mordant |
d) mordant
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Hematoxylin is an effective stain when it:
a) can only be used progressively b) contains chromophoric groupings c) influences the isoelectric point of proteins d) is polychromed |
b) contains chromophoric groupings
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Romanowsky-type stains are usually preferred for the demonstration of:
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leukocytes
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For the most transparency and clarity when viewing well-stained microscopic sections, the refractive index of the mounting medium should be:
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near that of the tissue
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Synthetic resins are preferred over natural resins because the synthetic resins:
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preserve the intensity of the stains with time
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Aqueous mounting media have an index of refraction that is:
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significantly below that of the tissue
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A decrease in section transparency can be caused by using:
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mounting medium that has become to thick
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Fixation with NBF will cause tissue cytoplasm to:
a) take up more hematoxylin b) take up more eosin c) be more difficult to blue d) resist acid decolorization |
a) take up more hematoxylin
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If the pH of the staining solution is between 4.6 and 5.0 eosin combines with which of the following chemical groups?
a) COO⁻ b) NH₃⁺ c) PO₃⁻ d) N=N |
b) NH₃⁺
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Which of the following can be added to an aqueous mounting medium to prevent bleeding of analine dyes into surrounding medium?
a) cane sugar b) Canada balsam c) glycerine d) gelatin |
a) cane sugar
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The Giemsa stain is most satisfactory if the pH is between:
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6.4 and 6.9
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Which of the following hematoxylin solutions must be used within a few days after preparation?
a) Gill b) Delafield c) Harris d) Weigert |
d) Weigert
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An organelle that causes the cytoplasm to show increased basophilia is the:
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rough endoplasmic reticulum
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T/F: Basic dyes have a negative charge.
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-False
-basic dyes have a positive charge, and bind with negatively charged particles |
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T/F: Oxidizers are sometimes used for differentiation.
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true
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T/F: Eosin is differentiated by the dehydrating alcohols.
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true
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T/F: An increase or decrease in the pH of the staining solution can alter staining by changing tissue and/or dye changes.
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true
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T/F: Staining is influenced by the fixative used.
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true
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T/F: Ferric chloride is both mordant and oxidizer.
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true
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T/F: Delafield hematoxylin is an iron hematoxylin.
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-false
-Weigert hematoxylin is an iron hematoxylin |
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T/F: An increase in temperature usually increases the rate of staining.
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true
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T/F: Frozen sections can be stained with thionin.
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true
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T/F: Resinous mounting media have an index of refraction much lower than that of the tissue.
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false
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T/F: Resinous mounting media are usually dissolved in toluene or xylene.
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true
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T/F: "The more, the better" is a good practice for applying mounting medium.
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false
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T/F: The nucleolus of plasma cells is stained green with the methyl green-pyronin technique.
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-false
-DNA is stained green |
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T/F: Bouin solution is a good fixative for tissue to be stained with the Feulgen reaction.
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-false
-bouin solution should not be used with the Feulgen reaction |
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Microscopic examination of an H&E-stained section shows nuclei with well-defined chromatin patterns, crisp nuclear membranes, and very pale pink staining of the cytoplasm and erythrocytes. These results indicate:
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a probable pH problem with the eosin
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An H&E-stained section shows reddish-brown stained nuclei, pink cytoplasm, and bright rose red erythrocytes. These results indicate:
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the use of overripened hematoxylin
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H&E-stained sections show very uneven staining with some areas of the slide well stained and other areas unstained. These results indicate that most likely the:
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paraffin was not completely removed
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While staining a rack of sections, it is noted that the water following rehydrating alcohols turns very cloudy. This can most likely be corrected by:
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changing the alcohols
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H&E-stained sections reveal brown pigment-like stippling and rare glossy black nuclei. This most likely has been caused by a mounting medium that:
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was applied after letting the slide dry
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H&E-stained sections of liver show very dark nuclei and some blue staining in the cytoplasm. This is most likely caused by:
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inadequate differentiation of the hematoxylin
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H&E-stained sections of small intestine reveal muscle, collagen, and red blood cells all stained the same shade of pink. This indicates:
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poor differentiation of the eosin
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A blue-black precipitate is seen on H&E-stained sections. This could probably be prevented in the future by:
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filtering the hematoxylin
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Water bubbles are seen microscopically on H&E-stained sections. This could probably be prevented in the future by:
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making sure that the dehydration step is complete
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Microscopic examination of an H&E-stained section of kidney is very difficult. Some areas of the tissue cannot be brought into focus, while other areas show excellent detail. This is most likely due to:
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mounting medium on top of the cover glass
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H&E-stained sections show hazy blue nuclei, but recuts from tissue processed a week previously and stained in the same basket show excellent nuclear staining. One possible cause of the problem is:
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the use of too much heat during processing
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A Feulgen stain is requested on a section of Bouin-fixed lymph node. The best course of action is to:
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ask if there is tissue in another fixative
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Sections for special stains have been accidentally stained with hematoxylin. To remove the hematoxylin, place the sections in:
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acid alcohol
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what 2 parts of a cell can be seen under light microscope?
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Nucleus and cytoplasm
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A resting cell is in what phase?
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Interphase (between 2 phases)
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The nuclear membran is usually stained a crisp dark blue with what kind of hematoxylin?
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Aluminum
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The nucleus contain both euchromatin and heterochromatin. Which one is stainable?
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heterochromatin is stainable
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Ionic bonding is also known as:
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salt linkage
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Below the IEF poin or pH 6 the net charge is---- and favors------ dyes
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positive acid (anionic)
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All dyes are --- compounds
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organic
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Lipid stains are----compounds
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nonionic (no charge)
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the oxidized dye is:
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hematein
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Hematoxylin is
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not a dye, it must be oxidized to become a dye
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List oxidizing agents
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sodium iodate
mercuric oxide potassium permanganate |
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Which hematoxlin dyes oxidize naturally?
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Ehrlich and Delafield
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Since ripening/ oxidation is ongoing, there should always be some---
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unoxidixed dye left in the solution
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Complete oxidation is the same as:
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overoxidation
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Which hematoxlin dyes oxidize chemically?
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Mayer
Harris Wigert Gill |
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What happens when a dye is overoxidized?
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It is brokendown and stains poorly
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The rate of oxidation is influenced by:
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pH
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Hematein forms quickly in a ----- solution (pH)
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basic
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Oxidixed hematein needs _______ to gain affinity for tissue
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a mordant
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If the oxizider and mordant are the same, what results?
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the solution becomes unstable
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List the non oxidizing mordants
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ammonium aluminum sulfate
potassium aluminum sulfate phosphotungstic acid phosphomolybdic acid |
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More selective nuclear staining can be achieved by adding:
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more aluminum or acid
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what is the mordant in Harris Hematoxylin?
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ammonium aluminum sulfate
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What is the oxidizer in harris Hematoxylin?
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Mercuric oxide or sodium iodate
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Harris Hematoxilyn gives good nuclear detail because____ is added?
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acetic acid
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In Harris Hematoxylin, the hematoxylin is dissolved in:
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alcohol
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What is Harris Hematoxylin composed of?
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Hematoxylin
Sodium iodate Alcohol Acetic acid Ammonium aluminum sulfate |
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Which of the following chemicals functions as an oxidizer?
a) aluminum sulfate b) sodium sulfite c) potassium permanganate d) acetic acid |
c) potassium permanganate
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Acidophilic tissue components that should appear stained different shades of pink following H&E staining are:
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muscle, collagen, and erythrocytes
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Differential staining of nuclei and cytoplasm with Giemsa solution is an example of:
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polychromasia
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Which of the following staining procedures is most suitable for demonstrating general tissue morphology?a) PAS
b) Verhoeff-van Gieson c) hematoxylin and eosin d) Wilder reticulin |
H&E
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After H&E staining, the cytoplasm in a tissue section appears hazy, obscure and contrasts poorly with the nuclei. The most likely cause is that:
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slides were not differentiated properly in alcohol
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Weigert hematoxylin solution is generally unsatisfactory for use after 3 to 4:
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days
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Microscopic sections stained with H&E show a lack of nuclear staining even though the hematoxylin is well-ripened and all other solutions are fresh. Which of the following factors could explain the poor result?
a) the slides were left too long in the neutralizer b) prolonged storage of wet tissue in unbuffered formalin c) the pH of the hematoxylin is between 2 an 2.4 d) the embedding paraffin is too hot |
-
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Sections are stained with Harris hematoxylin for 5 minutes and then treated with dilute hydrochloric acid. This type of staining is referred to as:
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regressive
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The selectivity for nuclear staining by Harris hematoxylin can be increased by adding:
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aluminum salts
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In slides stained with H&E, the sections appear very pink, with pale-reddish brown nuclei. Of the following, the most appropriate action is to:
a) restain the sections for a longer time in hematoxylin b) discard and replace the ammonia water c) replace the hematoxylin with fresh solution d) the inability to tone |
-
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If hematoxylin is unavailable, which of the following dyes is recommended as a substitute in a routine hematoxylin and eosin procedure?
a) methyl blue b) aniline blue c) Nile blue A d) celestine blue |
d) celestine blue
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Following hematoxylin and eosin staining, slides are dehydrated through ascending strengths of alcohol and cleared in xylene in the series is milky white. The most appropriate action is to:
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change alcohol and xylenes at the end of the series
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Microscopic evaluation of an H&E-stained section reveals dark deposits of material dispersed irregularly over the tissue. The most likely cause of this problem is that the hematoxylin solution:
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was not filtered before use
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Which of the following hematoxylin solutions contains ethylene glycol and aluminum sulfate?
a) Harris b) Delafield c) Gill d) Mayer |
-
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Which of the follownig is an iron hematoxylin solution that is frequently used for nuclear staining?
a) Harris b) Delafield c) Mayer d) Weigert |
d) Weigert
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A hematoxylin solution that is only used progressively is:
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Mayer
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Nuclei stained with a new Harris hematoxylin solution are predominately red and imprecisely outlined. This is most likely because of the use of:
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incompletely oxideized hematoxylin
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Which of the following acids in an alcoholic solution is most commonly used to differentiate aluminum-hematoxylin stained sections?
a) formic b) hydrochloric c) sulfuric d) acetic |
-
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In addition to hematoxylin and potassium or ammonium alum, a traditional solution of Mayer hematoxylin contains:
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sodium iodate, chloral hydrate and citric acid
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A phosphotungstic acid-hematoxylin solution can be ripened for immediate use by adding:
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potassium permanganate
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In the Feulgen reaction, hydrochloric acid reacts with DNA to create:
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aldehyde groups
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Microscopic review of H&E-stained sections reveals that the eosin is very pale. This is most likely due to:
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inadequate rinsing after neutralization
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Is Harris Hematoxylin a progressive or regressive stain?
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both
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