Gram-positive bacteria are generally resistant to complement-mediated lysis because
A. Thick peptidoglycan layer prevents insertion of membrane attack complex into the inner membrane
B. Gram-positive bacteria import the membrane attack complex and inactivate it
C. Membrane attack complex is degraded by the proteases produced by the Gram-positive bacteria
D. Gram-positive bacteria cannot activate the complement pathway
Answer: Option A
A. Arginine
B. Asparagine
C. Cysteine
D. Histidine
Recombinant live attenuated vaccine against hepatitis B was prepared from
A. Plasma of chronically infected individual
B. Recombinant yeast expressing hepatitis B surface antigen
C. Recombinant vaccinia virus expressing hepatitis B surface antigen
D. Transgenic plants expressing hepatitis B surface antigen
A. P and R only
B. P and Q only
C. Q and R only
D. P, Q and R
Which one of the following complement proteins is the initiator of the membrane attack complex?
A. C3a
B. C3b
C. C5a
D. C5b
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