Exam 10: Bacterial Growth

Use the figure below to answer the following questions. -In the figure of the bacterial growth curve what does the horizontal axis represent?

Use the figure below to answer the following questions. -In the figure of the bacterial growth curve which letter (A-D)indicates the region where the cells are dying at a greater rate than they are reproducing?

A consequence of raising the temperature above the maximum growth temperature when culturing bacteria produces a marked

A consequence of raising the pH above the optimum pH when culturing bacteria is

Answer true or false to the following statement: When the number of cells dying is equivalent to the number of cells being produced by cell division,stationary phase has been reached.

While ailment is attributed to Helicobacter pylori? Explain how H.pylori is able to withstand conditions found in the stomach.

How would you differentiate Streptococcus pyogenes from nonpathogenic streptococci?

Which growth characteristic best matches Treponema pallidum?

You have isolated a bacterium from the hot springs of Rotorua in New Zealand,one of the world's largest geothermal locations.It grows optimally between 45 and 60°C.This is an example of a(n)

Answer true or false to the following statement: Successful bacterial growth depends on the right temperature,pH,and osmotic pressure.

Answer true or false to the following statement: Chemically defined media are used to study bacterial end products.

Answer true or false to the following statement: Differential medium contains ingredients that that allow only a few species of bacteria to grow.

Answer true or false to the following statement: Eosin methylene blue agar allows Gram-positive,but not the growth of Gram-negative organisms.

Answer true or false to the following statement: Samples of cerebrospinal fluid are obtained by needle aspiration.

Explain the difference between selective and differential growth media,providing an example of each.Identify two media (other than those already used as examples)which act as both selective and differential media,and explain how to interpret the results.

Answer true or false to the following statement: Trace elements are not required for growth.

Answer true or false to the following statement: Pathogens of humans are chemoautotrophs.

Plant and meat extracts are commonly found in _____ media.

Answer true or false to the following statement: Superoxide dismutase is produced by obligate aerobes.

The reason that bacteria can grow in the presence of oxygen is that they contain