Question

______________ are employed to differentiate certain closely related organisms or groups of organisms. Depending on the presence of specific indicators or chemicals in the growth media, the organisms will tend to produce certain specific characteristic changes or growth patterns that can be used for further identification or differentiation steps. _______________ allows only the growth of certain types of organisms while inhibiting the growth of other organisms.

a.)Different media, disk-diffusion media

b.)Disk-diffusion media, different media

c.)Differential media, selective media

d.)Selective media, differential media

Answer 1

Option C is the answer

c.)Differential media, selective media

Differential media are also known as bacteriological growth media , contains specific ingredients which allow us to  distinguish selected species or we can easily categories bacteria only by visual observation. This media is also  used to differentiate between closely related organisms . Example- blood agar , EMB for lactose fermentor.

Selective media contains some ingredients that it inhibits groth of other organisms and allow only growth of selected organisms.  

answered by: anonymous