Biology

Biology, 07.07.2019 21:30, thestuckone

What can you conclude about the relationship between toxin secretion and culture density in s. aureus? select the three statements that are true. what can you conclude about the relationship between toxin secretion and culture density in s. aureus? select the three statements that are true. cultures grown at high density secrete significant amounts of toxin. the transition from culture densities that do not secrete toxin to those that do secrete toxin occurs quickly after a threshold is reached. cultures grown at low density do not secrete significant amounts of toxin. there is no relationship between culture density and the amount of secreted toxin for s. aureus. the relationship between culture density and toxin secretion is linear over the range of culture densities sampled?

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Health, 21.06.2019 21:20, genyjoannerubiera

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Biology, 02.08.2019 00:10, saniyawilliams1207

The skin of the bright orange south american toad secretes a lethal neurotoxin. assume that the toxin is produced by an enzyme encoded by a gene that has two alleles: t (dominant, wild-type enzyme/toxin) and t (recessive, no enzyme/toxin produced). the neurotoxin is secreted by means of a protein s produced by the wild-type gene s. the recessive allele s does not produce protein s (thus no secretion of the toxin can occur). a toad that cannot manufacture the enzyme/toxin and is heterozygous for the secretion gene is mated with a toad that cannot secrete the toxin and is heterozygous for the enzyme/toxin gene. what fraction of the progeny will be poisonous to the touch, that is, able both to manufacture and to secrete the toxin? use probability to solve the problem.

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Medicine, 14.09.2019 03:30, bennett2968

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Chemistry, 10.10.2019 20:10, oofoofoof1

Avirulence study was performed using staphylococcus aureus in mice. it was determined that the ld50 for the s. aureus alpha-toxin was 0.045 µg/kg of body weight toxin (a relatively low ld50). in the same mouse population, the id50 was determined to be 200,000 cells (a relatively high id50). what do these results taken together mean?

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