BIO 171 EXAM 4 QUESTIONS AND ANSWERS 2022 EDITION

True or False: Growth media is best suited for distinguishing between two similar species of bacteria. True False Growth media is designed to simply support (and not restrict) microbial growth. 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? Selective and Differential media Differential media Differential media distinguishes between two, often related, microbes. Growth media Selective media What are the requirements of a fastidious microbe? Your Answer: Fastidious microbe is an organism with complex requirements requirements ike absent it won't grow, enriched media contain those essential and specific nutrients required for growth of the particula subset of microorganisms 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 non-selective, non-differential media. True LB agar is the most basic type of agar and like LB media supports the growth of virtually all microbes without restriction. False The polysaccharide-based hardening agent added to LB media to produce LB agar is derived from what? Your Answer: Seaweed extract