Two Streptococcus Pneumoniae Strains, Agent 1 and Agent 2, Are

question 19

Essay

Two Streptococcus pneumoniae strains, agent 1 and agent 2, are administered to groups of animals at different doses. Mortality rates are then measured for the animals that received each dose level of each agent. Agent 1 is found to have an LD₅₀ of 400. Agent 2 is found to have an LD₅₀ of 600. Which one is producing a capsule and which one is not? How do you know?

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Definitions:

Bromides

Ionic compounds that contain a bromine ion (Br-) combined with another element or radical.

Reactivity

A measure of how readily a substance undergoes a chemical reaction with other substances.

Primary Iodides

Organic compounds where an iodine atom is bound to a primary carbon, typically involved in nucleophilic substitution reactions.

Nucleophilicity

A measure of the ability of a chemical species to donate an electron pair to an electrophile, thus forming a chemical bond.