Fixations - Study guides, Class notes & Summaries

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...

Histotechnology - Fixation What 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 h...

BOC Study Guide Histotechnology 2nd ed.- Fixation (HT) – Questions/Answers

nif cluster a genetically linked and coordinately regulated group of operons encoding genes required for nitrogen fixation What is the EBP for nif genes? NifA How does the activity of NifA differ from that of NtrC? The unmodified form of NifA is active NtrC needs to be phosphorylated to be active Under what 2 conditions does nif transcription occur? 1) Only in the absence of a fixed nitrogen source 2) Only if oxygen concentration not high enough to damage nitrogenase 2 What are th...

Biotechnology |Nitrogen Fixation and Photosynthesis & Transport of Molecules in Plant Questions and Answers

Endoplasmic Reticulum - Answer H&E basophilic staining within cytoplasm is due to what cellular structure? Pink - Answer Cytoplasm will show up what color on an H&E? 20 - Answer Proteins are made up of combinations of how many amino acids? Carboxyl group, side group - Answer All amino acids have an amino group and what other groups? Amphoteric - Answer Proteins can be _______, meaning they can be an acid or a base. Peptide bonds - Answer Amino acids are linked by...

Histopathology-Gross Examination & Fixation Exam Questions And Complete Solutions

BOC Fixation Exam Questions and Answers 2024.

An example of an additive fixative is one that contains: - picric acid Microscopic examination of an H&E stained section fixed in formalin shows marked nuclear bubbling. One most often sees this artifact if the specimen is processed following: - incomplete fixation Microscopic evalution of H&E stained sections from a surgically removed small bowl specimen shows an absence of much of the epithelium in otherwise normal tissue. This most likely resulted from: - delayed fixation When compared ...

BOC Fixation An example of an additive fixative is one that contains: A. Picric Acid B. Acetic Acid C. Ethyl Alcohol D. Acetone ANSWERS:- Picric Acid When compared with tissue fixed in formalin, tissue fixed in zinc-formalin will show: A. Better ultrastructural preservation B. Decreased immunoreactivity C. Increased enzyme activity D. Superior nuclear detail ANSWERS:- Superior nuclear detail Microscopic examination of an H&E stained section fixed in formalin shows marked nucle...