Portage Microbiology Lab Exam 9 Questions And Answers 2022( With Complete Solution Rated A)

Lab 9 Eaxm 1. Given Culture A and Culture B were accidentally mixed, what observations were made from the Gram stain (shown below)? Gram-positive cocci (spherical) clusters and Gram-negative bacillus (rods) were observed. 2. Given the results from a MacConkey agar plate shown below, what is the shape of Culture A? Culture B? MacConkey agar is selective for Gram-negative bacteria. Thus, Culture A must be Grampositive as no growth was observed. Coupled to the results of the gram stain, Culture A (Gram-positive) must be the cocci. Culture B must be Gram-negative (growth observed) and this correlates to the bacillus or rod-shaped bacteria. This study source was downloaded by from CourseH on :31:36 GMT -05:00 3. The hemolytic properties of both cultures were next examined by streaking each culture on a blood agar plate (shown below). What is the hemolytic status of Culture A? Culture B? Culture A exhibits beta hemolysis as defined by the region of clearing around the growing bacterial streak. Culture B exhibits gamma-hemolysis (non-hemolytic) as indicated by the white colonies growing on the still red agar.