Fixations - Study guides, Class notes & Summaries

Most coagulant fixatives achieve their full effect on tissue at any particular depth as soon as... - Answer they have penetrated to that depth at a concentration sufficient to cause coagulation. Fixative - Answer alters tissue by stabilizing the protein so that it is resistant to further changes. A fixative must change... - Answer the soluble contents of the cell into insoluble substances so that those substances are not lost during the subsequent processing steps. Denaturation - ...

Histotechnology - Fixatives, StainsAdditive fixatives - correct answers Chemically link, add themselves on to tissue and change it - Mercuric chloride - Chromium tetroxide - Zinc sulfate Nonadoptive fixatives - correct answers Organic compounds that act on tissue without chemically combining with it - Acetone - Alcohols Dissociate bound water molecules from tissue protein groups - Shrinkage, hardening with overexposure Coagulant fixatives - correct answers Establishes a network in...

Histotechnology - FixationThe primary purpose of fixation is to: a. stop enzymatic action b. remove the water from the tissue c. provide support for the tissue d. autolyze the tissue - correct answers a Which of the following fixatives contains picric acid, formalin, and acetic acid? a. Zenker b. Helly c. Bouin d. Zamboni - correct answers c The volume of fixative should exceed the volume of the tissue by: a. 1 time to 2 times b. 5 times to 10 times c. 15 times to 20 ...

The most important step in the preparation of high quality microscopic slides of tissue is: - Answer ensuring adequate fixation The breakdown of tissue due to enzyme activity is called: - Answer autolysis The breakdown of tissue by bacterial action is called: - Answer putrefaction A physical agent used in fixation is: - Answer heat The volume of fixing fluid employed should be: - Answer 15-20 times that of the tissue The rate of fixation varies with the fixative and is a...

Histotechnology - FixationWhat are the steps tissue must go through before it is viewed under a microscope? - correct answers 1. Fixation 2. Processing 3. Embedding 4. Microtomy 5. Staining 6. Coverslipping Define fixation. - correct answers The preservation of cells and tissue in as life-like a way as possible by stabilizing the protein so that it is resistant to further changes. What are the functions of fixation? - correct answers 1. To prevent putrefaction and autolysis 2. To hel...

CSMLS Histology Fixation Questions with complete solutions. The primary purpose of fixation is to: a. stop enzymatic action b. remove the water from the tissue c. provide support for the tissue d. autolyze the tissue - correct answers.a. enzymes are proteins and rendered inactive by fixation Which of the following fixatives contains picric acid, formalin and acetic acid a. Zenker b. Helly c. Bouin d. Zamboni - correct answers.c. Bouin The ratio of f...

Microscopic examination of a PAS stained section reveals marked nonspecific staining. This could be caused by fixation in: - correct answers glutaraldehyde solution The pathologist is sure that urate crystals were present in a tissue biopsy and should therefore be present in the H&E stained section, but polarization of the tissue is negative. This could possibly result from the: - correct answers use of water-based fixative Formaldehyde reacts primarily with which of the following protein ...

Histology (HT/HTL exam): Fixation questions with correct answers

QUIZ #10 WITH ANSWERS Self-Efficacy refers to our experience of our own... A) fixations B) superego C) competence D) self serving bias ANSWER = C) competence The defense mechanism in which self-justifying explanations replace the real, unconscious reasons for actions is... A) projection B) denial C) rationalization D) displacement ANSWER = C) rationalization In western cultures, introversion is belittled in part because people tend to equate introversion with... A) selfishness B...

Regulation of nitrogen fixation exam questions and answers nif cluster - Answer- a genetically linked and coordinately regulated group of operons encoding genes required for nitrogen fixation What is the EBP for nif genes? - Answer- NifA How does the activity of NifA differ from that of NtrC? - Answer- The unmodified form of NifA is active NtrC needs to be phosphorylated to be active Under what 2 conditions does nif transcription occur? - Answer- 1) Only in the absence of a fixed nitrog...