3812047
Question 1
Question
1- lipid A is a cell wall component of :
Answer
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gram - positive bacteria
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gram - negative bacteria
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fungi
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algae
Question 2
Question
2- all of the followings about mesosomes are true except :
Answer
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present in prokaryotes
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lateral type play arole in cell division
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Invaginations from CM
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high efficiency of active transport
Question 3
Question
3- which is the following statement is true concerning fimbriae :
Answer
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most gram -ve bacteria have aset of fimbraie
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present only in motile strains
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once removed they do not regenerate during cell growth
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they are longer & thicker than flagella
Question 4
Question
4- the following acts as areceptor site for attractants & repellents :
Answer
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sex pili
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cell membrane
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flagella
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cell wall
Question 5
Question
5- failure to synthesize CW leads to production of :
Answer
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mycoplasma
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spheroplast
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none of the above
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all of the above
Question 6
Question
positive selection of T cells :
Answer
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(a)cell recognising self Ag are selected to survive
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(b)cells recognizing foreign MHC are selected to die
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(c)result in self tolerance
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(d)occure in Bm
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(e)cells recognising MHc mol are selected to survive
Question 7
Question
positive feed back stimulation of T cells is mediated by
Answer
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(a)IfN gama
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(b)Il2
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(c)Cd40l
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(d)none of the above
Question 8
Question
Naive T &B cell lymphocytes are
Answer
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(a)effector cells
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(b)mature cells befor encoutering Ag
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(c)present in scondary lymphoid organs
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(d)all above
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(e) b&c
Question 9
Question
MHC class 2 on Apcs is recognized by t cell through
Answer
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(a)CD8
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(b)TcR
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(c)CD 4
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(d)CD3
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(e) b&c
Question 10
Question
which of following interact with MHC for stabilization
Answer
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(a)CD4
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(b)CD 3
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(c)TCR
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(d)TLRs
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