Biology
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

You are infected by a virus
Having waited a day, it is too late to take an antibiotic
You need to be vaccinated instead of taking an antibiotic
You need an antiseptic, not an antibiotic

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Biology
A genus can best be defined as

A taxon comprised of classes
A taxon composed of families
A taxon composed of one or more species and a classification level lying below family
The most specific taxon

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