Pub Med (First year activities)

During preparation, a researcher specifically wants to demonstrate tissue lipids. Which approach is more advantageous? A. Routine paraffin processing B. Frozen section C. Dehydration with alcohol followed by paraffin D. Clearing with xylene before sectioning

A tissue sample must be examined within minutes during surgery. Which method is most appropriate? A. Paraffin section B. Frozen section C. Serial paraffin section D. Resin embedding

The fixative has the following functions EXCEPT? A. Hardens the tissue B. Preserves the structure of the tissue C. Prevents the staining of the tissue D. Kills the bacteria in the tissue

حتى زلال البيض طلع له فائدة👍👍

One statement is NOT correct? A. Dehydration occurs by descending grades of alcohol B. Xylol is a solvent used for clearing C. Embedding occurs in the hard paraffin D. Egg albumin is used for mounting of the sections on the glass slides

Concerning the paraffin technique, the followings are fixative EXCEPT? A. Formol saline (4% formaldehyde) B. Bouin's fluid C. Susa D. Xylol

Easy👍

78- Golgi complex? A Has convex surface called maturing face B Has concave surface called forming surface C Has wide cisternae tend to narrow at the end D None of above

Which part connects the eyepiece to the objective lens? A. Nosepiece B. Body tube C. Stage D. Condenser

Compound microscope has A one lense B two lense C three lense D more than that

The DNA between adjacent nucleosomes is called: A. Central DNA B. Linker DNA C. Coding DNA D. Mitochondrial DNA

DNA is negatively charged mainly because of its: A. Amino groups B. Phosphate groups C. Histones D. Nitrogenous bases

The core histones are: A. H1, H2A, H2B, H3 B. H2A, H2B, H3, H4 C. H1, H2A, H3, H4 D. H1 only

The basic structural unit of chromatin is: A. Ribosome B. Nucleosome C. Centriole D. Proteasome

Which histone is considered a linker histone? A. H2A B. H2B C. H3 D. H1

During slide preparation, dehydration is a necessary step because : a. Paraffin and water are immiscible b. Paraffin and water are miscible c. Paraffin and water partially miscible d. None of the above