Biochemistry

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Q. What is the role of disulfide bonds in peptides?
  • A. To form peptide bonds
  • B. To stabilize tertiary structure
  • C. To create secondary structure
  • D. To facilitate enzyme activity
Q. What is the role of DNA ligase in DNA replication?
  • A. Unwinds DNA
  • B. Synthesizes RNA primers
  • C. Joins Okazaki fragments
  • D. Adds nucleotides
Q. What is the role of glutamine in nitrogen metabolism?
  • A. Energy source
  • B. Nitrogen donor
  • C. Carbon source
  • D. Hormone precursor
Q. What is the role of glutamine in the body?
  • A. Energy source
  • B. Nitrogen transport
  • C. Hormone production
  • D. Antioxidant
Q. What is the role of HDL cholesterol in the body?
  • A. Transporting cholesterol to cells
  • B. Removing excess cholesterol from the bloodstream
  • C. Storing triglycerides
  • D. Increasing inflammation
Q. What is the role of IgE antibodies?
  • A. To fight bacterial infections
  • B. To mediate allergic reactions
  • C. To activate complement system
  • D. To enhance phagocytosis
Q. What is the role of lactose permease in the lac operon?
  • A. To synthesize lactose
  • B. To transport lactose into the cell
  • C. To degrade lactose
  • D. To inhibit the repressor
Q. What is the role of lysosomes in a cell?
  • A. Energy production
  • B. Digestion of macromolecules
  • C. Protein synthesis
  • D. Cell signaling
Q. What is the role of memory cells in the immune system?
  • A. To initiate the immune response
  • B. To remember past infections
  • C. To produce antibodies
  • D. To destroy pathogens
Q. What is the role of monoclonal antibodies in medicine?
  • A. To enhance immune response
  • B. To target specific cells or proteins
  • C. To replace missing antibodies
  • D. To prevent infections
Q. What is the role of phosphofructokinase in glycolysis?
  • A. Regulatory enzyme
  • B. Energy production
  • C. Substrate-level phosphorylation
  • D. Dehydrogenation
Q. What is the role of primers in PCR?
  • A. To stabilize the DNA
  • B. To initiate DNA synthesis
  • C. To degrade unwanted DNA
  • D. To amplify RNA
Q. What is the role of regulatory sequences in genes?
  • A. To code for proteins
  • B. To initiate transcription
  • C. To terminate transcription
  • D. To enhance mutation rates
Q. What is the role of reverse transcriptase in recombinant DNA technology?
  • A. To synthesize DNA from RNA
  • B. To cut DNA at specific sites
  • C. To ligate DNA fragments
  • D. To amplify DNA sequences
Q. What is the role of ribosomal RNA (rRNA)?
  • A. Transcription of DNA
  • B. Translation of mRNA
  • C. Replication of DNA
  • D. Repair of DNA
Q. What is the role of RNA-binding proteins?
  • A. To synthesize DNA
  • B. To stabilize RNA structures
  • C. To degrade proteins
  • D. To replicate DNA
Q. What is the role of the buffer in gel electrophoresis?
  • A. To provide nutrients to the gel
  • B. To maintain pH and conduct electricity
  • C. To stain the DNA
  • D. To solidify the gel
Q. What is the role of the electron transport chain in ATP synthesis?
  • A. Substrate-level phosphorylation
  • B. Oxidative phosphorylation
  • C. Fermentation
  • D. Glycolysis
Q. What is the role of the magnetic field in NMR spectroscopy?
  • A. To ionize the sample
  • B. To separate molecules
  • C. To align nuclear spins
  • D. To heat the sample
Q. What is the role of the side chain (R group) in amino acids?
  • A. Determines the amino acid's charge
  • B. Determines the amino acid's polarity
  • C. Determines the amino acid's reactivity
  • D. All of the above
Q. What is the role of the stationary phase in HPLC?
  • A. To provide a mobile phase
  • B. To separate analytes based on their interactions
  • C. To inject the sample
  • D. To detect the analytes
Q. What is the role of the TATA box in transcription?
  • A. It is a coding region
  • B. It is a binding site for RNA polymerase
  • C. It is a site for RNA splicing
  • D. It is a termination signal
Q. What is the role of UV luminance spectroscopy in cancer research?
  • A. Identifying genetic mutations
  • B. Monitoring treatment efficacy
  • C. Detecting early-stage tumors
  • D. Analyzing tumor microenvironments
Q. What is the role of Vitamin K in the body?
  • A. Bone mineralization
  • B. Antioxidant defense
  • C. Blood clotting
  • D. Energy production
Q. What is the significance of the 'gene of interest' in recombinant DNA technology?
  • A. It is the DNA sequence that is cloned
  • B. It is the vector used for cloning
  • C. It is the enzyme used for cutting DNA
  • D. It is the host organism
Q. What is the significance of the annealing temperature in PCR?
  • A. It determines the speed of DNA synthesis
  • B. It affects the specificity of primer binding
  • C. It controls the amount of DNA produced
  • D. It is irrelevant to the PCR process
Q. What is the significance of the equilibrium constant (K) in thermodynamics?
  • A. It indicates the speed of a reaction
  • B. It determines the direction of a reaction
  • C. It reflects the ratio of products to reactants at equilibrium
  • D. It measures the energy change of a reaction
Q. What is the significance of the protein p53 in relation to DNA?
  • A. It promotes DNA replication
  • B. It acts as a tumor suppressor by regulating the cell cycle
  • C. It synthesizes RNA
  • D. It repairs DNA damage
Q. What is the significance of the start codon?
  • A. It signals the end of translation
  • B. It codes for a stop signal
  • C. It initiates protein synthesis
  • D. It regulates gene expression
Q. What is the significance of using a buffer during protein purification?
  • A. To increase protein solubility
  • B. To maintain pH and ionic strength
  • C. To enhance protein activity
  • D. To precipitate unwanted proteins
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