Microbiology Quiz

What is the good function of most bacteria?

• Used in food industry

• Harmful to humans

• Essential for breaking down organic matter

• Cause food spoilage

How can large numbers of spoilage organisms affect food?

• Cause discoloration

• Cause odor

• Cause slime

• All of the above

What is the function of the cell wall in bacteria?

• Allows bacteria to move in liquids

• Gives the bacterium its shape

• Contains the genetic material

• Controls passage of waste & nutrients

What is the term for the process of bacteria reproducing by splitting into two?

• Generation Time

• Binary Fission

• Binary Fusion

• Vegetative State

Under ideal conditions, how often can some food poisoning bacteria split in two?

• 20 minutes

• 30 minutes

• 10 minutes

• 40 minutes

What is the pH level at which most bacteria will not multiply?

• pH of 7

• pH above 7

• pH below 4

• pH less than 7

Which type of bacteria can multiply only in the presence of oxygen?

• Anaerobes

• Aerobes

• Salmonella

• Facultative anaerobes

What is the main function of flagella in bacteria?

• Contains the genetic material

• Controls passage of waste & nutrients

• Gives the bacterium its shape

• Allows bacteria to move in liquids

What is the term for the attachments that allow bacteria to move in liquids?

• Vehicles

• Nuclear material

• Cytoplasm

• Flagella

What is the main function of the cell membrane in bacteria?

• Gives the bacterium its shape

• Controls passage of waste & nutrients

• Contains the genetic material

• Allows bacteria to move in liquids