1. The causative agent for elephantiasis is the roundwormWuchereria bancrofti which is an example of a(n)___________________?

2. 		protozoan
   		alga
   		helminth
   		none of these

1. In an A-B exotoxin, which component binds to a receptor on thehost cell?

   		the A component
   		the B component

1. Which of these cell types are not immunologically specific?

2. 		B cell
   		T helper cell
   		natural killer (NK) cells
   		all of these are correct

1. Lysozymes _________.  

   		destroy bacterial cell walls
   		are found in tears
   		are found perspiration
   		all these are correct

1. Innate immunity ______________.

		is always slower than adaptive immunity in responding topathogens
		is nonspecific and present at birth
		involves a memory component
		involves T cells and B cells

1. Regarding the complement system, which of these is a possibleresult?

		cytolysis
		inflammation
		opsonization
		all these are correct

1. Which of these is true about the structure of antibodies?

   		they have 2 heavy chains and 2 light chains
   		they have constant regions (C) and variable regions (V)
   		chains are linked together by disulfide bridges
   		all of these are correct

1. Which of the following is not one of Koch’s postulates?

		same pathogen must be present in every case of the disease
		the pathogen must be isolated from the diseased host and grownin pure culture
		the isolated pathogen must cause the disease when it isinoculated into a healthy, susceptible laboratory animal
		all of these represent one of Koch’s postulates