Pink/red colonies on a MacConkey agar plate indicates

Green, metallic colored colonies on EMB agar plates is indicative of 

A positive oxidase test will appear

What is broad-spectrum antibiotic vs. a narrow-spectrum antibiotic? 

Give the dilution of each of the tubes and the dilution of each of the plates.  Dilution3.jpg

When you place 1.0 ml of sample into 99 ml of water, what is the dilution?

(03.01 MC) Seasonal variations in ocean temperatures can impact the populations of living organisms in the ocean. How would a phytoplankton population be affected by these changes? (3 points)

This type of medium can be used to differentiate between coliform and noncoliform bacteria. 

(02.05 HC) In 2015 in Alaska, an enormous number of walrus females and their calves gathered on a single beach. In the past, the walruses would use sea ice as a place to rest and nurse their calves, but due to human activity and global warming, large amounts of the ice have melted. Explain what consequences could happen to the walruses and their ecosystem in this situation over time. (5 points)

Name 1 way microorganisms are beneficial in the field of medicine.