__________ is a solidifying agent derived from seaweed used to make solid growth medium.

After performing the viable plate count, 50 colonies are counted on a plate with a final dilution of 1:1,000. Calculate the CFUs/mL.

A sugar fermentation broth containing lactose is inoculated with an unknown sample. Following incubation, the broth in the tube is a bright yellow color. What does this mean?

What would be the correct result in a Kligler’s Iron agar tube inoculated with an organism that only ferments glucose and reduces sulfur. 

Prior to reading the results of the Voges-Proskauer test, what must be added to the tube?

When performing the spread plate method, prior to plating a _____________ must be performed. 

Which of the following is considered a structural stain?

Following addition of hydrogen peroxide, a positive result for catalase will show

What must be included in sugar fermentation broth in order to detect gas production?

Southerners used all of the following to justify slavery EXCEPT: