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1	Gene products of the major histocompatibility complex in humans:
	A)	are expressed on all cells
	B)	can be excreted in sweat
	C)	help the immune system distinguish pathogenic invaders in the body
	D)	a and c
	E)	all of the above
2	Based upon their collected data, the scientists suggest that humans tend to:
	A)	choose mates with similar MHC genes
	B)	choose mates with dissimilar MHC genes
	C)	do not appear to choose a mates based upon MHC gene composition
3	Based upon their collected data, the scientists suggest that:
	A)	the influence of MHC genes on mate selection decreases genetic variability in offspring
	B)	the influence of MHC genes on mate selection confers a selective immunological advantage in offspring
	C)	the influence of MHC genes on mate selection could have influenced the evolution of early humans by enhancing their resistance to pathogens and toxins
	D)	b and c
	E)	all of the above
4	The scientists suggest that MHC genes exert an effect on mate selection through which perceived sense?
	A)	vision
	B)	scent
	C)	sound
	D)	none of the above