Portage Microbiology BIOD171 Exam questions with correct answers

Portage Microbiology BIOD171 Exam questions with correct answers True or False: Differential media is best suited for distinguishing between two similar species of bacteria - CORRECT ANS-True Growth media does not contain restrictive factors, while selective media is best used to encourage the growth of one microbe while simultaneously discouraging the growth of the other. Since two similar species of microbes are being studied they must be differentiated under similar but just slightly different conditions (differential media). A researcher is asked to determine which of two vials contains E coli and which contains salmonella. Knowing both are Gram-negative while only one of them is capable of fermenting lactose, which type of media would be best suited? - CORRECT ANS-Differential media What are the requirements of a fastidious microbe? - CORRECT ANS-A fastidious microbe is an organism with complex growth requirements such that if absent it will not grow. Enriched medias thus contain these specific and essential nutrients required for the growth of a particular subset of microorganisms. True or False: LB agar is classified as a selective, non-differential media. - CORRECT ANS-False. The polysaccharide-based hardening agent added to LB media to produce LB agar is derived from what? - CORRECT ANS-Seaweed (algae) extract. Blood agar is which type of medium? Select all that apply. Selective Enriched Selective and Differential Differential - CORRECT ANS-Enriched Differential Match the fo