#1
Which technique is commonly used for preserving biological specimens for analysis?
Drying
Freezing
Fermentation
Radiation
#2
What is the primary purpose of fixing biological specimens?
Preservation
Enhancing color
Increasing size
Reducing weight
#3
Which staining technique is commonly used to visualize cell nuclei?
Hematoxylin and Eosin (H&E) staining
Gram staining
Acid-fast staining
Immunofluorescence staining
#4
In biological specimen analysis, what does PCR stand for?
Protein Chain Reaction
Polymerase Chain Reaction
Plasma Chromatography Reaction
Photochemical Respiration
#5
Which of the following is a common method for preparing biological specimens for electron microscopy?
Staining with dyes
Embedding in plastic resin
Freezing in liquid nitrogen
Air-drying
#6
What is the main advantage of using immunohistochemistry in biological specimen analysis?
Enhanced color contrast
Visualization of specific proteins or antigens
Faster processing time
Reduced sample size
#7
What is the purpose of paraffin embedding in histology?
To increase sample size
To preserve tissues at low temperatures
To facilitate thin sectioning
To enhance color contrast
#8
Which microscopy technique is suitable for studying the surface structures of biological specimens?
Transmission electron microscopy (TEM)
Scanning electron microscopy (SEM)
Confocal microscopy
Fluorescence microscopy
#9
What is the primary purpose of a biosafety cabinet in a laboratory setting?
To store biological specimens
To ensure the safety of researchers
To analyze DNA sequences
To visualize cellular structures
#10
Which method is commonly used for extracting DNA from biological specimens?
Polymerase Chain Reaction (PCR)
Western blotting
Centrifugation
DNA extraction kits
#11
Which type of microscopy is suitable for visualizing live cells and dynamic cellular processes?
Transmission electron microscopy (TEM)
Scanning electron microscopy (SEM)
Confocal microscopy
Fluorescence microscopy
#12
What is the main advantage of using liquid nitrogen for specimen storage?
Enhanced color contrast
Preventing microbial growth
Preserving samples at extremely low temperatures
Increasing sample size
#13
What is the purpose of cryopreservation in biological specimen storage?
To enhance color
To prevent microbial growth
To preserve samples at extremely low temperatures
To increase the sample size
#14
Which bioinformatics tool is commonly used for analyzing DNA sequences in biological specimens?
BLAST
Excel
Photoshop
AutoCAD
#15
What does ELISA stand for in the context of biological specimen analysis?
Enzyme-Linked Immunosorbent Assay
Electron Longitudinal Imaging System Analysis
Epigenetic Locus Identification and Sorting Algorithm
Erythrocyte Lysis Inhibitor Assay
#16
In flow cytometry, what does FACS stand for?
Fluorescent Activated Cell Sorting
Fast Analysis and Counting System
Freezing and Cooling System
Functional Analysis of Cellular Structures
#17
In DNA analysis, what does STR stand for?
Single Tandem Repeat
Short Tandem Repeat
Specific Target Region
Strand Termination Reaction
#18
What is the function of a microtome in biological specimen preparation?
To measure microorganisms
To cut thin sections of tissues for microscopy
To amplify DNA
To stain cellular structures
#19
Which technique is used for identifying and quantifying proteins in biological specimens?
Chromatography
Mass spectrometry
Western blotting
Immunoprecipitation
#20
What is the purpose of a control group in biological specimen analysis experiments?
To compare experimental and control groups
To amplify DNA
To preserve specimens
To perform immunohistochemistry
#21
In fluorescence microscopy, what is used to excite fluorophores and generate fluorescence?
Electrons
X-rays
Ultraviolet light
Infrared light
#22
What is the purpose of a nucleic acid hybridization technique in biological specimen analysis?
To purify DNA
To identify specific nucleotide sequences
To freeze specimens
To measure cellular structures
#23
Which of the following is an example of a non-invasive imaging technique in biological specimen analysis?
Biopsy
MRI (Magnetic Resonance Imaging)
Histology
Cytology
#24
What is the primary function of a spectrophotometer in biological specimen analysis?
To visualize cellular structures
To measure absorbance of light by substances
To conduct PCR reactions
To perform Western blotting
#25
Which technique is commonly used for studying the three-dimensional structure of biological specimens?
X-ray crystallography
Electron microscopy
Confocal microscopy
Immunoprecipitation