#1
Which of the following techniques is used to separate proteins based on their size?
Western blotting
Gel electrophoresis
Mass spectrometry
Nuclear magnetic resonance spectroscopy
#2
Which of the following reagents is commonly used to denature proteins?
Tris buffer
Ethanol
Sodium dodecyl sulfate (SDS)
Acetonitrile
#3
What is the purpose of a Bradford assay in biochemistry?
To quantify DNA concentration
To measure enzyme activity
To quantify protein concentration
To determine pH of a solution
#4
What is the purpose of an enzyme-linked immunosorbent assay (ELISA) in biochemistry?
To quantify gene expression
To determine protein concentration
To measure enzyme activity
To identify specific antibodies or antigens
#5
Which of the following chromatography techniques separates biomolecules based on their affinity for a ligand?
Size exclusion chromatography
Affinity chromatography
Ion exchange chromatography
Gas chromatography
#6
Which of the following techniques is used to separate DNA fragments based on size?
Polymerase chain reaction (PCR)
Western blotting
Gel electrophoresis
High-performance liquid chromatography (HPLC)
#7
What is the purpose of a Coomassie Blue stain in protein gel electrophoresis?
To visualize DNA bands
To measure enzyme activity
To quantify protein concentration
To visualize protein bands
#8
Which of the following is NOT a common method for protein purification?
Affinity chromatography
Gel filtration chromatography
Western blotting
Ion exchange chromatography
#9
Which of the following is a common method for protein quantification?
Bradford assay
Polymerase chain reaction (PCR)
Western blotting
Mass spectrometry
#10
Which of the following is a common method for DNA quantification?
ELISA
UV spectrophotometry
Bradford assay
HPLC
#11
Which of the following is NOT a commonly used buffer in biochemistry?
Phosphate buffered saline (PBS)
Tris-HCl
Ethanol
HEPES
#12
What is the primary function of a spectrophotometer in biochemistry?
To measure enzyme activity
To disrupt cells and tissues
To visualize protein bands
To measure absorbance of samples
#13
Which of the following techniques is used to purify proteins based on their charge?
Gel filtration chromatography
Affinity chromatography
Ion exchange chromatography
High-performance liquid chromatography (HPLC)
#14
Which of the following is NOT a common method for protein quantification?
Bradford assay
Bicinchoninic acid (BCA) assay
Lowry assay
Gas chromatography
#15
Which of the following techniques is used to determine the three-dimensional structure of proteins?
X-ray crystallography
Western blotting
Enzyme-linked immunosorbent assay (ELISA)
Polymerase chain reaction (PCR)
#16
Which of the following is NOT a commonly used reducing agent in biochemistry?
β-mercaptoethanol
Dithiothreitol (DTT)
Ethanol
Triton X-100
#17
What is the primary function of a sonicator in biochemistry experiments?
To measure absorbance of samples
To disrupt cells and tissues
To visualize protein bands on a gel
To purify proteins
#18
Which of the following is a common buffer used in protein electrophoresis?
Sodium chloride (NaCl)
Tris-HCl
Ethanol
Sodium dodecyl sulfate (SDS)
#19
Which of the following techniques is used to determine the concentration of nucleic acids in a sample?
Polymerase chain reaction (PCR)
Gel electrophoresis
Bradford assay
UV spectrophotometry
#20
What is the function of a centrifuge in biochemistry experiments?
To measure pH of a solution
To mix reagents
To separate components based on density
To quantify enzyme activity
#21
What is the purpose of a SDS-PAGE gel in biochemistry experiments?
To visualize DNA bands
To determine protein concentration
To separate proteins based on size
To measure enzyme activity
#22
Which of the following techniques is commonly used to determine the molecular weight of proteins?
Western blotting
Mass spectrometry
Gel electrophoresis
NMR spectroscopy
#23
What is the function of a chromatography column in biochemistry experiments?
To visualize protein bands
To measure absorbance of samples
To separate components based on size, charge, or affinity
To quantify enzyme activity
#24
Which of the following techniques is used to determine the secondary structure of proteins?
X-ray crystallography
Mass spectrometry
Circular dichroism spectroscopy
Nuclear magnetic resonance spectroscopy
#25
What is the function of a protease inhibitor in protein purification?
To prevent denaturation of proteins
To inhibit protease activity and prevent protein degradation
To enhance protein binding to chromatography resin
To increase the solubility of proteins