B cells mature in which organ ()
A. bone marrow
B. Thymus
C. bursa Fabricii
D. lymph node
E. Spleen
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Peptide binding groove in MHC I molecule can contain ()
A. 6-8 AA
B. 8-10 AA
C. 10-13 AA
D. 13-17 AA
E. 17-25 AA
The main components of endotoxin are ()
A. protein
B. lipopolysaccharide
C. nucleic acid
D. flagella
E. none of the above
Which one of the following is NOT true about the bacterial nucleus ()
A. Nuclear membrane
B. Nucleolus
C. Mitotic
DNA
E. none of the above
What is not anabolic product of bacteria ()
A. endotoxin
B. exotoxin
C. anti-toxin
D. pigment
E. none of the above
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