Latest Essential Microbiology

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BIOD 171 Q & A

(Latest 2023 / 2024) Essential Microbiology

Portage Learning Module 4 Exam

M4: Module 4 Exam - Requires Respondus

LockDown Browser + Webcam 2023 / 2024

True or False: Differential media is best suited for distinguishing between two similar species of bacteria.

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).

False

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

Selective media

Growth media 1 / 2

Question 3 Not yet graded / 10 pts Question 4

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Question 5 Not yet graded / 5 pts

Differential media

Differential media distinguishes between two, often related, microbes.

What are the requirements of a fastidious microbe?

Your Answer:

A fastidious microbe requires enriched media which contains specific and essential nutrients for the growth of a specific subgroup of microorganisms. Fastidious microbes have complex growth requirements and without the enriched media they will not grow.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 (algae) Seaweed (algae) extract.

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