apes quiz on 2/24

The LD50LD50 for arsenic in humans is 13mg/kg13mg/kg. Which of the following approaches should be used to calculate the number of grams of arsenic it would take to reach the LD50LD50 in a 140-pound person? [Note: 1kg=2.2pounds1kg=2.2pounds]

140lb × 1kg2.2lb × 13mg1kg ×1 g1,000mg

A pesticide was applied to a population of roaches, and it was determined that the LD50LD50 was 55mgkg55mgkg. If the average mass of a roach was 0.02kg0.02kg, which of the following approaches will determine the dose in mgmg per roach?

55mg1kg × 0.02kg

Based on the data in the graph, which of the following should be used to calculate the difference in LD50LD50 for the two different species of mice?

575mg−490mg

An individual is exposed to the water in the stream from which the sample show in the graph was taken. If the individual was exposed to the highest dose of the bacteria, which of the following bacteria would have the lowest probability of causing illness if ingested?

C. jejuni

Which of the following examples includes both a point and a nonpoint source of pollution?

Fertilizer from suburban lawns and wastewater from a water treatment plant

Which of the following is a point source pollutant that would likely affect the ecosystem health of a coral reef?

Oil released from the broken hull of a shipwrecked tanker

Which of the following is the best example of a point source pollutant?

Oil tanker spill

If all four of the bacteria species shown in the graph are equally likely to contaminate agricultural products at a dose of 102 CFU102⁢ , regulating which of the following species would have the greatest effect in reducing the likelihood of illness in humans?

Salmonella spp

Some drinking water standards allow bacteria in water at dosages up to the 10% probability of illness. Which of the following statements is best supported by the data in the graph?

The newly discovered bacterium would have the lowest allowable dosage to meet the drinking water standards.