BSC 117 Quiz 5

____________ are antimicrobial agents that are safe for living tissues, while _________ are toxic or harmful to tissues.

Antiseptics; disinfectants

We can distinguish different types of bacteria through: colony morphology cellular morphology gram staining all of these

all of these

Which of the following are means to control bacterial growth? antibiotics antiseptics disinfectants all of these

all of these

The prefix "strepto-" indicates what type of cellular arrangement? a-cells arranged in aggregated masses without definition b-cells joined linearly in a chain c-cells paired off two by two d-none of these

b

Rod shaped bacteria are known as

bacilli

Gram staining is used to identify the complexity of

bacteria? bacterial cells? bacterial cell walls?

Bacteria divide through which of the following mechanisms? mitosis meiosis binary fission nuclear fusion

binary fission

Spherical bacteria are known as

cocci

The palisade arrangement is the same as the staphylo- arrangement.

false

In the Gram stain, Gram-positive bacteria stain with a _________ color due to the incorporation of the_________ dye into their cell wall.

purple; crystal violet

Bacteria only exist as in pure culture in the laboratory. In the environment, they exist in diverse groups of different genera and species. What technique would you use to isolate/generate a pure culture from an environmental sample such as dirt? gram stain streak plate iodine-emersion zinc sulfate flotation

streak plate (?)

After gram staining, gram-positive cells will retain the color of which dye?

the crystal violet iodine complex is retained by the gram positive cells

t/f: Bacterial colonies are aggregations of millions of cells that grow from a single parental bacterium.

true

When testing antimicrobial agents, the area surrounding the disk where no bacterial growth occurs is known as the

zone of inhibition (x)