moloko1531

1) some non hemolytic streptococci that normally colonize the human throat produce metabolites and inhibit the growth of streptococcus pyogenes a common cause of strep throat. The relationship that exists between the non hemolytic streptococci and the human host is
A-mutualistic
B-commensalistic
C-parasitic
D- antagonistic
E- ammensalistic

2- the LD50 of a pathogenic organism is a measurement of
A- survival value of host population
B- virulence of organism
C- mutualistic characteristics of the strain
D- commensalistic potential of the strain
E- none of the above

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