For a certain insecticide, the ld-50 dosage level for rats is determined to be 250 milligrams per kilograms of body mass. on the basis of this information, which of the following is the best prediction regarding the consequences of receiving this dosage of the insecticide

This question is incomplete, here is the complete question:

For a certain insecticide, the LD-50 dosage level for rats is determined to be 250 milligrams per kilogram of body mass. On the basis of this information, which of the following is the best prediction regarding the consequences of receiving this dosage of the insecticide?

a) Fifty percent of any rat population would be sickened

b) Fifty percent of the population of any warm-blooded animal would die

c) Fifty percent of any population of mosquitoes would die

d) Five hundred out of every one thousand people would experience acute effects

e) Five hundred out of every one thousand rats would die

Explanation:

The LD-50 dosage is normally used in toxicology assays and is known as the median lethal dose of a compound (toxins or pollutants for example). This value represents the quantity of a substance that is required to kill fifty percent of a given population that is under a test for a fixed period of time.

The units in which the  LD50 is usually expressed are mass of toxic compound administered per unit body mass of the organisms that is tested (milligrams of substance per kilogram of body weight)

Based on the concepts explained before and on the information provided by the question, the best prediction is e. Five hundred out of every one thousand rats would die . This is true because the statement refers to the correct specie for which the LD-50 dosage was estimated (rats), express the correct percentage of individuals (fifty percent of one thousand is five hundred) and the proper consequences (death).

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products