Which statement about antibiotics is correct?

A bacterial population contains a few resistant individuals before any antibiotic is used. After antibiotic treatment, resistant bacteria become common. Which statement best explains this observation?

Match the experimental term with correct description. 

A fake treatment given to a control group is called a __________.

Which macromolecule is composed of simple sugars?

A new resistance gene spreads rapidly through a bacterial population because bacteria exchange DNA. Which process is illustrated?

Vegetable oil forms a separate layer when mixed with water because lipids are:

Why is anecdotal evidence generally considered less reliable than scientific evidence?

Sweating on a hot day and shivering on a cold day are examples of:

Which process best explains increasing resistance after repeated antibiotic use?