#1
Which technique is commonly used for preserving biological specimens for analysis?
Freezing
ExplanationFreezing is commonly used to preserve biological specimens by halting biochemical processes.
#2
What is the primary purpose of fixing biological specimens?
Preservation
ExplanationFixing biological specimens primarily aims at preserving their structure and integrity for analysis.
#3
Which staining technique is commonly used to visualize cell nuclei?
Hematoxylin and Eosin (H&E) staining
ExplanationHematoxylin and Eosin staining is commonly used to differentiate cell nuclei and cytoplasm in histological specimens.
#4
In biological specimen analysis, what does PCR stand for?
Polymerase Chain Reaction
ExplanationPCR stands for Polymerase Chain Reaction, a technique used to amplify specific DNA sequences for analysis.
#5
Which of the following is a common method for preparing biological specimens for electron microscopy?
Embedding in plastic resin
ExplanationEmbedding biological specimens in plastic resin allows for thin sectioning and electron microscopy analysis.
#6
What is the main advantage of using immunohistochemistry in biological specimen analysis?
Visualization of specific proteins or antigens
ExplanationImmunohistochemistry enables the visualization and localization of specific proteins or antigens within biological tissues.
#7
What is the purpose of paraffin embedding in histology?
To facilitate thin sectioning
ExplanationParaffin embedding is used in histology to preserve tissue morphology and facilitate thin sectioning for microscopy analysis.
#8
Which microscopy technique is suitable for studying the surface structures of biological specimens?
Scanning electron microscopy (SEM)
ExplanationScanning electron microscopy (SEM) is suitable for studying the surface morphology and ultrastructure of biological specimens at high resolution.
#9
What is the primary purpose of a biosafety cabinet in a laboratory setting?
To ensure the safety of researchers
ExplanationA biosafety cabinet is used to provide a contained and sterile environment, ensuring the safety of researchers working with hazardous biological materials.
#10
What is the purpose of cryopreservation in biological specimen storage?
To preserve samples at extremely low temperatures
ExplanationCryopreservation is used to store biological samples at ultra-low temperatures to maintain their viability over extended periods.
#11
Which bioinformatics tool is commonly used for analyzing DNA sequences in biological specimens?
BLAST
ExplanationBLAST (Basic Local Alignment Search Tool) is commonly used for comparing DNA sequences and identifying homologous sequences in biological specimens.
#12
What does ELISA stand for in the context of biological specimen analysis?
Enzyme-Linked Immunosorbent Assay
ExplanationELISA is an acronym for Enzyme-Linked Immunosorbent Assay, a technique used to detect and quantify specific proteins or antibodies in biological specimens.
#13
In flow cytometry, what does FACS stand for?
Fluorescent Activated Cell Sorting
ExplanationFACS stands for Fluorescent Activated Cell Sorting, a technique used in flow cytometry to sort and analyze cells based on their fluorescent properties.
#14
In DNA analysis, what does STR stand for?
Short Tandem Repeat
ExplanationSTR stands for Short Tandem Repeat, a type of DNA sequence consisting of short repeating units used in DNA profiling and analysis.
#15
What is the function of a microtome in biological specimen preparation?
To cut thin sections of tissues for microscopy
ExplanationA microtome is used in biological specimen preparation to precisely cut thin sections of tissues for microscopic analysis.
#16
Which technique is used for identifying and quantifying proteins in biological specimens?
Western blotting
ExplanationWestern blotting is a technique used to identify and quantify specific proteins in biological samples based on their molecular weight and antigenicity.