Review the animation and answer the questions that follow to test your understanding.

1.			Light chains are made of
			A)	one V and one J segment in the variable region plus a constant region that is common in all light chains
			B)	one V, one D, and one J segment in the variable region plus a constant region that is common in all light chains
			C)	one V and one J segment in the variable region plus one of two possible different constant region segments
			D)	one V and one J in the variable region and no constant region
2.			Heavy chains
			A)	all have the same constant region
			B)	have one of two possible constant regions
			C)	have one of five possible constant regions
			D)	have one of eight possible constant regions
3.			The V, J, and D segments
			A)	must be a matching set
			B)	are each selected randomly
			C)	are present in the constant region of the heavy chain
			D)	are RNA sequences
4.			Human cells have separate genes for each antibody molecule.
			A)	True
			B)	False
5.			The m gene codes for the constant region of the light chain in IgM antibody.
			A)	True
			B)	False