Biochemistry

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Q. At what temperature does denaturation typically occur in PCR?
  • A. 50°C
  • B. 72°C
  • C. 95°C
  • D. 37°C
Q. During DNA replication, which strand is synthesized continuously?
  • A. Lagging strand
  • B. Leading strand
  • C. Okazaki strand
  • D. Template strand
Q. How do allosteric activators affect enzyme kinetics?
  • A. Increase Vmax
  • B. Decrease Km
  • C. Both A and B
  • D. No effect on Vmax or Km
Q. How does UV luminance spectroscopy help in assessing skin health?
  • A. By measuring hydration levels
  • B. By detecting melanin concentration
  • C. By analyzing UV-induced DNA damage
  • D. By evaluating blood flow
Q. In anaerobic conditions, pyruvate is converted to which substance?
  • A. Acetyl-CoA
  • B. Ethanol
  • C. Lactate
  • D. Oxaloacetate
Q. In biological systems, what does Gibbs free energy indicate?
  • A. The total energy of a system
  • B. The spontaneity of a process
  • C. The temperature of the system
  • D. The pressure exerted by gases
Q. In FTIR spectroscopy, what is the purpose of the interferometer?
  • A. To amplify signals
  • B. To separate wavelengths
  • C. To create an interference pattern
  • D. To cool samples
Q. In gas chromatography, what is the role of the carrier gas?
  • A. To dissolve the sample
  • B. To provide a medium for separation
  • C. To react with the sample
  • D. To cool the system
Q. In immunohistochemistry, what is the role of the primary antibody?
  • A. To bind to the target antigen
  • B. To amplify the signal
  • C. To visualize the tissue
  • D. To fix the tissue sample
Q. In mass spectrometry, what is the purpose of the ionization process?
  • A. To separate molecules by size
  • B. To convert molecules into ions
  • C. To measure absorbance
  • D. To enhance fluorescence
Q. In NMR spectroscopy, what does a peak represent?
  • A. Presence of impurities
  • B. Concentration of the sample
  • C. Type of solvent used
  • D. Number of equivalent nuclei
Q. In the absence of lactose, what is the state of the lac operon?
  • A. Fully active
  • B. Partially active
  • C. Inactive
  • D. Overactive
Q. In thin-layer chromatography (TLC), what is the purpose of the solvent front?
  • A. To carry the sample up the plate
  • B. To act as a stationary phase
  • C. To visualize the compounds
  • D. To cool the plate
Q. What are the three main steps of PCR?
  • A. Denaturation, annealing, extension
  • B. Denaturation, transcription, translation
  • C. Ligation, denaturation, amplification
  • D. Amplification, sequencing, visualization
Q. What autoimmune condition is characterized by muscle weakness due to the immune system attacking acetylcholine receptors?
  • A. Myasthenia Gravis
  • B. Guillain-Barré Syndrome
  • C. Multiple Sclerosis
  • D. Rheumatoid Arthritis
Q. What autoimmune disease is associated with the destruction of the thyroid gland, leading to hypothyroidism?
  • A. Graves' Disease
  • B. Hashimoto's Thyroiditis
  • C. Celiac Disease
  • D. Sjögren's Syndrome
Q. What autoimmune disease is characterized by the production of antibodies against the body's own tissues, particularly affecting the skin and joints?
  • A. Rheumatoid Arthritis
  • B. Systemic Lupus Erythematosus
  • C. Multiple Sclerosis
  • D. Type 1 Diabetes
Q. What condition is characterized by the immune system attacking the myelin sheath of nerve fibers?
  • A. Myasthenia Gravis
  • B. Multiple Sclerosis
  • C. Crohn's Disease
  • D. Psoriasis
Q. What condition results from a deficiency in the enzyme ornithine transcarbamylase?
  • A. Phenylketonuria
  • B. Urea cycle disorder
  • C. Maple syrup urine disease
  • D. Homocystinuria
Q. What does a negative ΔG value signify in a biochemical reaction?
  • A. The reaction is at equilibrium
  • B. The reaction is non-spontaneous
  • C. The reaction is spontaneous
  • D. The reaction requires energy input
Q. What does a splitting pattern in an NMR spectrum indicate?
  • A. Presence of impurities
  • B. Number of neighboring protons
  • C. Concentration of the sample
  • D. Type of solvent used
Q. What does FTIR stand for in the context of spectroscopy?
  • A. Fourier Transform Infrared
  • B. Frequency Time Infrared
  • C. Fast Time Infrared
  • D. Fourier Time Infrared
Q. What does HPLC stand for?
  • A. High Performance Liquid Chromatography
  • B. High Pressure Liquid Chromatography
  • C. High Precision Liquid Chromatography
  • D. High Purity Liquid Chromatography
Q. What does NMR stand for in the context of spectroscopy?
  • A. Nuclear Magnetic Resonance
  • B. Nonlinear Molecular Resonance
  • C. Nuclear Mass Resonance
  • D. Neutron Magnetic Resonance
Q. What does the chemical shift in an NMR spectrum indicate?
  • A. Concentration of the sample
  • B. Type of solvent used
  • C. Electronic environment of nuclei
  • D. Temperature of the sample
Q. What effect does an allosteric activator have on enzyme activity?
  • A. Decreases enzyme activity
  • B. Increases enzyme activity
  • C. Has no effect
  • D. Inhibits substrate binding
Q. What effect does increasing temperature generally have on protein stability?
  • A. Increases stability
  • B. Decreases stability
  • C. No effect
  • D. Depends on the protein
Q. What happens to enzymes at high temperatures?
  • A. They become more active
  • B. They denature and lose function
  • C. They remain unchanged
  • D. They increase substrate affinity
Q. What happens when lactose is present in the environment of E. coli?
  • A. The lac repressor binds to the operator
  • B. Transcription of the lac operon is inhibited
  • C. The lac repressor is inactivated
  • D. cAMP levels decrease
Q. What is a common use of UV luminance spectroscopy in pharmaceuticals?
  • A. Determining drug efficacy
  • B. Analyzing drug stability
  • C. Measuring drug absorption
  • D. Identifying drug interactions
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