Question

39)

Which is not applicable to Neisseria meningitidis?

	A.	It is a Gram-negative diplococcus
	B.	Opa protein, phase variation, and a capsule are virulence factors for it.
	C.	It is capable of crossing the blood-brain barrier
	D.	It is a foodborne disease
	E.	There is a vaccine available for it.

40)

Which statement is true regarding B cells?

	A.	They represent cell-mediated immunity portion of the adaptive immune response.
	B.	They would be activated by antigen-presenting cells such as macrophages.
	C.	Memory B cells are the antibody producing B cell type.
	D.	They would not respond to cells infected with a virus.
	E.	None of the above is true.

Answer 1

Ans39) it is a waterborne disease

Explanation: Neisseria meningitis is a sexually transmitted diseases .

Main virulence factors for Neisseria meningitis are capsule,Opa protein, and phase variation.

Neiseria meningitis cross brain blood barrier in approximately 60% cases

There are vaccine available for bacterial nesseria mengitidis

Ans-40)E)None of the above is true

Explanation:B cell represent humoral-mediated immunity portion of the adaptive immune responsewhile Tell represent cell mediated immune response.

Bell itself act as professional Antigen presenting cell which present antigen to Tell for their activation

Memory. Cell do not form antibodies infact they are memory cell formed on first encountor but on reexposure antigen they differentiate into plasma B cell which produce antibodies.

B cell respond to viral infections.