stain because the acidic properties of the negative stain kills bacteria on contact making it
possible for us to be able to observe them.
B.Define the three major types of bacterial shapes. Which of these did you observe in the
C.Is Crystal Violet a basic substance or an acidic substance? Is Congo red a basic or an
acidic substance? Describe how you were able to arrive at this conclusion and relate
your findings to your experimental observations.
A.Describe the difference between Gram-negative and Gram-positive bacteria. Which
type of bacteria are most often treatable with antibiotics and why?