Determine the following for positive staining. (a) dye, (b) charge of the chromophore/colored ion, (c) charge of the target cellular structure, (d) applications/target cell structure  2.Determine the following for negative staining. (a) dye, (b) charge of the chromophore/colored ion, (c) charge of the target cellular structure, (d) applications/target cell structure

Which of the following correctly matches the chromatography technique with the molecular property being exploited for separation? ion-exchange: charge,affinity: polarity, gel-filtration: molecular mass ion-exchange: charge, affinity:molecular binding preference,gel-filtration: molecular size ion-exchange: charge,affinity: molecular binding preference,gel-filtration: isoilectric point ion-exchange: ion binding preference,affinity: molecular size,gel-filtration:polarity

43) The major setback for the use of Transmission Electron Microscope is that: a) You can’t stain the sample with colored dyes b) You can’t see internal structures of the cell c) You can’t focus on Organelles inside the cell d) you can’t focus on cell membranes44) The major advantage of using the Scanning Electron Microscope (SEM) over the Transmission Electron Microscope (TEM) is that: a) You can use live material in looking through the SEM and not the TEM b) You can look at internal structures with SEM & not TEM c) You can use higher magnifications with SEM d) You can look at solid objects with SEM45) The image that you are observing in the SEM comes from: a) Direct reflection/bouncing of electrons from the specimen you are looking at b) Backscattered electros from the secondary electrons from the specimen c) A contrast between the texture of the specimen you are looking at d) A contrast between the acidophilic and basophilic components of the specimen you are looking at46) A…

92. Which of the following is the most prominent ultrastructural characteristic of interstitial (Leydig) cells? A) Centrioles B) Numerous microtubules C) Rough endoplasmic reticulum D) Smooth endoplasmic reticulum E) Zymogen granules

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