Exam 10: Bacterial Growth

Bacteria requiring multiple growth factors to survive are classified as _____ bacteria.

Answer true or false to the following statement: Blood agar is a defined medium.

The _____ growth temperature is the temperature at which the fastest growth rate occurs.

Answer true or false to the following statement: A GasPak™ jar is often used to culture Clostridium perfringens.

Use the figure below to answer the following questions. -In the figure of the bacterial growth curve which letter (A-D)indicates the region of the growth curve where the number of new cells formed equals the number of cells dying?

Which of the following is not a method used to count viable bacteria?

A thioglycolate tube was inoculated with an unknown bacterium.After overnight incubation growth is seen only in the area several millimeters below the surface of the agar.This bacterium exhibits a growth pattern characteristic of a(n)

Which growth characteristic best matches Escherchia coli?

Answer true or false to the following statement: Answer true or false to the following statement: The lag phase is when bacteria are most sensitive to antibiotics.

Before the widespread use of refrigerators,people often preserved their food for long-term storage by adding large amounts of salt.In the context of osmotic pressure,why is this process effective against food spoilage? Are all microorganisms inhibited by high salt?

Which growth characteristic best matches Helicobacter pylori?

You need to culture Clostridium perfringens and will use a GasPak™ jar.Explain how a GasPak™ jar ensures that oxygen is removed from the environment.How will you know that an anaerobic state has been reached?

Answer true or false to the following statement: The time interval needed for a bacterial colony to form is called the half-life.

Answer true or false to the following statement: Pathogens of humans can be facultative anaerobes.

Chemoheterotrophs obtain carbon by

Use the figure below to answer the following questions. -What part of the growth curve is the region where number of living cells is increasing exponentially?

Which growth medium is needed to culture Haemophilus influenzae in the laboratory? How is this medium made and why is it needed?

Answer true or false to the following statement: Obligate anaerobes can grow in the presence of oxygen under some conditions.

You have cultured a bacterial specimen obtained from an abscess on mannitol salt agar.On the following day you note growth and a yellow zone around the colonies.Your specimen is most likely to be

A throat swab specimen was cultured on a blood agar plate.Colonies are formed,which produce a greenish halo around the colonies.These bacteria are exhibiting