Lab Quiz 12

A  Perform serial dilutions on a broth culture and pipet a small amount in melted agar.

B  Using a cotton swab, apply the bacteria across the surface of the agar

C  Pour the entire contents of a broth culture on the surface of an agar plate.

D  Using an inoculating loop, apply the streak plate method to obtain isolated colonies

A  They are effective against viruses

B  They are compounds made from scratch in a laboratory to inhibit or kill organisms

C  They are natural compounds made by an organism that can be used to inhibit or kill other organisms.

D  They are natural compounds that are modified in the laboratory to inhibit other organisms

A  TRUE

B  FALSE

A  Two of these are correct

B  The region around the disk that shows no growth

C  The thick layer of a single species of bacteria

D  The region around the disk that shows growth

A  All of these are appropriate ways to prepare the filter paper disk method.

B  The broth culture of a bacterial species is poured through a filter paper and placed on a sterile agar plate.

C  The targeted bacterial species is isolated using the streak plate method and filter paper disks submerged in disinfectants are placed on the isolated colonies.

D  A bacterial lawn of the targeted bacterial species is prepared and filter paper disks submerged in various disinfectants are placed on the plate.

A  shoter

B  longer

A  It cannot penetrate cloudy liquids

B  It cannot penetrate solid surfaces

C  All of these are correct

D  If used on body cells, it can cause mutations and lead to cancer

A  physical

B  minimal

C  chemical

D  extreme

A  the cell membrane of a pathogen

B  the cell wall of a pathogen

C  the proteins of a pathogen

D  all of these are correct

A  the destruction or removal of the majority of the pathogens

B  two of these are correct

C  the destruction or removal of all microbial life and viruses

D  some microbes that remain