Biochemistry

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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
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
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
Q. What is the primary function of branched-chain amino acids (BCAAs)?
  • A. Energy production
  • B. Protein synthesis
  • C. Hormone regulation
  • D. Neurotransmitter synthesis
Q. What is the primary function of DNA in cells?
  • A. Energy production
  • B. Protein synthesis
  • C. Genetic information storage
  • D. Cellular respiration
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
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
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
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
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
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
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
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
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
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
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
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
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
Q. What is the primary function of Vitamin B1 (Thiamine)?
  • A. Antioxidant
  • B. Energy metabolism
  • C. Bone health
  • D. Vision
Q. What is the primary function of Vitamin B12?
  • A. DNA synthesis
  • B. Antioxidant
  • C. Calcium absorption
  • D. Collagen formation
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
Q. What is the primary organ responsible for nitrogen metabolism in the human body?
  • A. Liver
  • B. Kidney
  • C. Lungs
  • D. Spleen
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
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
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
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
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
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
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
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
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