Q. What is the primary factor that affects protein stability in a cellular environment?
-
A.
Temperature
-
B.
pH level
-
C.
Ionic strength
-
D.
All of the above
Solution
All of the above factors can significantly influence protein stability.
Correct Answer:
D
— All of the above
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Q. What is the primary function of antibodies in the immune system?
-
A.
To transport oxygen in the blood
-
B.
To neutralize pathogens
-
C.
To produce hormones
-
D.
To regulate body temperature
Solution
Antibodies are proteins produced by the immune system that specifically recognize and neutralize pathogens such as bacteria and viruses.
Correct Answer:
B
— To neutralize pathogens
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Q. What is the primary function of antibodies?
-
A.
To destroy pathogens directly
-
B.
To bind to antigens and neutralize them
-
C.
To produce more antigens
-
D.
To activate T cells
Solution
The primary function of antibodies is to bind to antigens and neutralize them.
Correct Answer:
B
— To bind to antigens and neutralize them
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Q. What is the primary function of branched-chain amino acids (BCAAs)?
-
A.
Energy production
-
B.
Protein synthesis
-
C.
Hormone regulation
-
D.
Neurotransmitter synthesis
Solution
Branched-chain amino acids (leucine, isoleucine, and valine) primarily promote protein synthesis and muscle recovery.
Correct Answer:
B
— Protein synthesis
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Q. What is the primary function of DNA in cells?
-
A.
Energy production
-
B.
Protein synthesis
-
C.
Genetic information storage
-
D.
Cellular respiration
Solution
DNA primarily serves as the genetic blueprint for the development and functioning of living organisms.
Correct Answer:
C
— Genetic information storage
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Q. What is the primary function of enhancers in gene regulation?
-
A.
To terminate transcription
-
B.
To promote transcription from a distance
-
C.
To splice RNA
-
D.
To degrade mRNA
Solution
Enhancers are regulatory DNA sequences that promote transcription from a distance by interacting with transcription factors.
Correct Answer:
B
— To promote transcription from a distance
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Q. What is the primary function of enzymes in the body?
-
A.
To provide energy
-
B.
To catalyze biochemical reactions
-
C.
To transport oxygen
-
D.
To store genetic information
Solution
Enzymes act as catalysts that speed up biochemical reactions without being consumed in the process.
Correct Answer:
B
— To catalyze biochemical reactions
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Q. What is the primary function of G-protein coupled receptors (GPCRs) in cell signaling?
-
A.
Transport ions across the membrane
-
B.
Activate intracellular signaling pathways
-
C.
Synthesize proteins
-
D.
Degrade extracellular signals
Solution
GPCRs primarily function to activate intracellular signaling pathways upon binding to ligands.
Correct Answer:
B
— Activate intracellular signaling pathways
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Q. What is the primary function of mRNA in protein synthesis?
-
A.
To transport amino acids
-
B.
To carry genetic information from DNA
-
C.
To form the ribosome structure
-
D.
To catalyze peptide bond formation
Solution
mRNA carries genetic information from DNA to the ribosome for protein synthesis.
Correct Answer:
B
— To carry genetic information from DNA
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Q. What is the primary function of oxidative phosphorylation in cellular respiration?
-
A.
To produce glucose
-
B.
To generate ATP
-
C.
To consume oxygen
-
D.
To produce carbon dioxide
Solution
Oxidative phosphorylation primarily generates ATP through the electron transport chain and chemiosmosis.
Correct Answer:
B
— To generate ATP
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Q. What is the primary function of T cells in the immune response?
-
A.
Produce antibodies
-
B.
Directly kill infected cells
-
C.
Activate B cells
-
D.
Phagocytize pathogens
Solution
T cells are primarily responsible for directly killing infected cells and coordinating the immune response.
Correct Answer:
B
— Directly kill infected cells
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Q. What is the primary function of T cells in the immune system?
-
A.
Produce antibodies
-
B.
Destroy infected cells
-
C.
Activate B cells
-
D.
Phagocytize pathogens
Solution
T cells are primarily responsible for directly killing infected cells and coordinating the immune response.
Correct Answer:
B
— Destroy infected cells
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Q. What is the primary function of the lac operon in E. coli?
-
A.
To regulate amino acid synthesis
-
B.
To control lactose metabolism
-
C.
To enhance DNA replication
-
D.
To promote cell division
Solution
The lac operon regulates the metabolism of lactose in E. coli by controlling the expression of genes required for lactose uptake and breakdown.
Correct Answer:
B
— To control lactose metabolism
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Q. What is the primary function of the nucleus in a cell?
-
A.
Energy production
-
B.
Protein synthesis
-
C.
Genetic material storage
-
D.
Cellular respiration
Solution
The nucleus stores the cell's genetic material (DNA) and is responsible for regulating gene expression.
Correct Answer:
C
— Genetic material storage
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Q. What is the primary function of the phospholipid bilayer in cell membranes?
-
A.
Energy production
-
B.
Selective permeability
-
C.
Protein synthesis
-
D.
Cell division
Solution
The phospholipid bilayer provides selective permeability, allowing certain substances to pass while blocking others.
Correct Answer:
B
— Selective permeability
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Q. What is the primary function of the TCA cycle?
-
A.
Fatty acid synthesis
-
B.
Amino acid degradation
-
C.
Energy production through oxidation of acetyl-CoA
-
D.
Nucleotide synthesis
Solution
The TCA cycle primarily functions in the oxidation of acetyl-CoA to produce energy in the form of ATP.
Correct Answer:
C
— Energy production through oxidation of acetyl-CoA
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Q. What is the primary function of thermodynamics in biological systems?
-
A.
To regulate blood pressure
-
B.
To determine energy transfer and transformation
-
C.
To control hormone levels
-
D.
To manage immune responses
Solution
Thermodynamics helps in understanding how energy is transferred and transformed in biological systems.
Correct Answer:
B
— To determine energy transfer and transformation
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Q. What is the primary function of transcription factors?
-
A.
To degrade RNA
-
B.
To initiate transcription of specific genes
-
C.
To replicate DNA
-
D.
To package DNA
Solution
Transcription factors are proteins that bind to specific DNA sequences to regulate the transcription of genes, initiating the process.
Correct Answer:
B
— To initiate transcription of specific genes
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Q. What is the primary function of Vitamin B1 (Thiamine)?
-
A.
Antioxidant
-
B.
Energy metabolism
-
C.
Bone health
-
D.
Vision
Solution
Vitamin B1 (Thiamine) is crucial for energy metabolism, particularly in carbohydrate metabolism.
Correct Answer:
B
— Energy metabolism
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Q. What is the primary function of Vitamin B12?
-
A.
DNA synthesis
-
B.
Antioxidant
-
C.
Calcium absorption
-
D.
Collagen formation
Solution
Vitamin B12 is essential for DNA synthesis and the formation of red blood cells.
Correct Answer:
A
— DNA synthesis
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Q. What is the primary immune-mediated condition that affects the gastrointestinal tract and is triggered by gluten?
-
A.
Celiac Disease
-
B.
Ulcerative Colitis
-
C.
Crohn's Disease
-
D.
Irritable Bowel Syndrome
Solution
Celiac Disease is an autoimmune disorder where ingestion of gluten leads to damage in the small intestine.
Correct Answer:
A
— Celiac Disease
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Q. What is the primary organ responsible for nitrogen metabolism in the human body?
-
A.
Liver
-
B.
Kidney
-
C.
Lungs
-
D.
Spleen
Solution
The liver is the primary organ responsible for nitrogen metabolism, including the urea cycle.
Correct Answer:
A
— Liver
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Q. What is the primary principle behind infrared spectroscopy?
-
A.
Absorption of UV light
-
B.
Vibrational transitions of molecules
-
C.
Emission of X-rays
-
D.
Scattering of visible light
Solution
Infrared spectroscopy is based on the absorption of infrared light, which causes vibrational transitions in molecules.
Correct Answer:
B
— Vibrational transitions of molecules
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Q. What is the primary principle behind NMR spectroscopy?
-
A.
Ionization of molecules
-
B.
Magnetic properties of nuclei
-
C.
Absorption of UV light
-
D.
Fluorescence of compounds
Solution
NMR spectroscopy is based on the magnetic properties of certain nuclei, which resonate in a magnetic field.
Correct Answer:
B
— Magnetic properties of nuclei
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Q. What is the primary purpose of chromatography in a clinical laboratory?
-
A.
To separate and analyze complex mixtures
-
B.
To sterilize medical equipment
-
C.
To measure blood pressure
-
D.
To perform surgical procedures
Solution
Chromatography is primarily used to separate and analyze complex mixtures in clinical laboratories.
Correct Answer:
A
— To separate and analyze complex mixtures
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Q. What is the primary purpose of ELISA in immunology?
-
A.
To measure the concentration of antibodies
-
B.
To isolate specific cells
-
C.
To visualize tissue samples
-
D.
To amplify DNA
Solution
ELISA (Enzyme-Linked Immunosorbent Assay) is primarily used to measure the concentration of antibodies or antigens in a sample.
Correct Answer:
A
— To measure the concentration of antibodies
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Q. What is the primary purpose of gas chromatography in clinical laboratories?
-
A.
To separate and analyze volatile compounds
-
B.
To measure blood glucose levels
-
C.
To perform DNA sequencing
-
D.
To culture bacteria
Solution
Gas chromatography is primarily used to separate and analyze volatile compounds in various samples.
Correct Answer:
A
— To separate and analyze volatile compounds
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Q. What is the primary purpose of gel electrophoresis in molecular biology?
-
A.
To amplify DNA sequences
-
B.
To separate nucleic acids or proteins based on size
-
C.
To sequence DNA
-
D.
To clone genes
Solution
Gel electrophoresis is primarily used to separate nucleic acids or proteins based on their size.
Correct Answer:
B
— To separate nucleic acids or proteins based on size
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Q. What is the primary purpose of protein purification?
-
A.
To increase protein concentration
-
B.
To isolate a specific protein from a mixture
-
C.
To denature proteins
-
D.
To enhance protein activity
Solution
The primary purpose of protein purification is to isolate a specific protein from a mixture for further study or use.
Correct Answer:
B
— To isolate a specific protein from a mixture
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Q. What is the primary purpose of recombinant DNA technology?
-
A.
To create genetically modified organisms
-
B.
To clone human organs
-
C.
To sequence human genomes
-
D.
To diagnose genetic disorders
Solution
Recombinant DNA technology is primarily used to create genetically modified organisms by combining DNA from different sources.
Correct Answer:
A
— To create genetically modified organisms
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