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Home ‣ Microbiology ‣ Antibody See What Others Are Saying!
  • Question

  • Self reactive antibodies are not found in significant concentration in normal serum because


  • Options
  • A. it is impossible to generate a self-reactive antibody
  • B. self reactive B cells are killed by CD8 T cells
  • C. B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide
  • D. self reactive B cells switch to IgA which is all secreted and not present in serum

  • Correct Answer
  • B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide 

    • More questions

    • 1. Verotoxin 1 of Escherichia coli is similar to

    • Options
    • A. cholera toxin
    • B. shiga toxin
    • C. heat-stable enterotoxin of E. coli
    • D. heat-labile enterotoxin of E. coli
      • Discuss
    • 2. Most of the energy in aerobic respiration of glucose is captured by

    • Options
    • A. substrate-level phosphorylation
    • B. electron transport of electrons from NADH
    • C. long-chain fatty acid oxidation
    • D. the enzyme formic-hydrogen lyase
      • Discuss
    • 3. Which binding is inhibited by pactamycin?

    • Options
    • A. Aminoacyl-tRNA to the A-site of 30S subunit
    • B. Initiator-tRNA to 30S/40S initiation complexes
    • C. Peptidyl t-RNA to the 50S subunit
    • D. Formation of peptide bond in P site
      • Discuss
    • 4. Lactobacilli grow best under

    • Options
    • A. strict anaerobic conditions
    • B. microaerophilic conditions in presence of 5% CO2 and PH6
    • C. microaerophilic conditions in presence of 3% CO2 and PH5
    • D. microaerophilic conditions in presence of 2% CO2 and PH4
      • Discuss
    • 5. Lysozyme is present in

    • Options
    • A. sweat
    • B. Cerebro spinal fluid (CSF)
    • C. urine
    • D. saliva
      • Discuss
    • 6. How many oxygen molecules are required in the fermentation of one molecule of glucose to ethanol and CO2?

    • Options
    • A. 0 
    • B. 1
    • C. 2
    • D. 36
      • Discuss
    • 7. If the Keq for an enzymatic reaction is greater than 1, the reaction

    • Options
    • A. will be endergonic
    • B. can not occur without the input of energy
    • C. both (a) and (b)
    • D. none of these
      • Discuss
    • 8. In the reaction, C6H12O6+ 6O2 ? 6CO2 + 6H2O + energy, which component is being oxidized?

    • Options
    • A. C6H12O6
    • B. O2
    • C. CO2
    • D. H2O
      • Discuss
    • 9. The three domain version of life on earth is based on the

    • Options
    • A. nucleic acid sequence data
    • B. morphological traits
    • C. metabolic traits
    • D. characteristics of the cell wall
      • Discuss
    • 10. The manufacture of baker's yeast involve

    • Options
    • A. S. cerevisiae
    • B. S. thermophillus
    • C. Bacillus subtilis
    • D. none of these
      • Discuss

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