Exam 3 Microbio

Human pathogens grow best between pH 5 and 8, making them ________.

• Extremophiles

• Acidophiles

• Neutralophiles

• Alkaliphiles

Organisms that have an absolute dependence on abundant oxygen for cellular processes are __________.

• facultative anaerobes
• aerobes

• anaerobes

• obligate aerobes

Organisms that die in the presence of oxygen because they cannot eliminate reactive oxygen species are known as __________.

• facultative anaerobes
• aerotolerant anaerobes

• facultative aerobes

• obligate anaerobes

Tags

NGSS.HS-LS2-3

Each organic and inorganic component in __________ media is completely known and quantified.

• defined
• complex

• complete

• selective

_________ media are best described as singling out bacteria with specific properties by encouraging the growth of certain bacteria while suppressing the growth of others.

• Selective
• defined

• complex

• Differential

________ media would be most effective for selecting for Staphylococcus aureus growth.

• TSA

• MSA

• EMB

• LB

Choose the true statement about a bacterial colony?

• A colony derives from a single cell

• Colonies can be grown using broth media

• Colony isolation requires concentrating a specimen

• A pure culture would generate colonies with diverse features

The purpose of the streak plate technique is:

• to dilute and spread the culture on the plate so that individual colonies are easily observed.

• to encourage the growth of only one type of bacteria.

• to encourage the growth of organisms that grow without oxygen.

• to determine the metabolic properties of an organism.

Which of the following indirect methods of enumerating bacteria measures the turbidity of a sample?

• Spectrophotometer (OD600nm)

• Biomass

• 
  Biochemical activity ( D/W)

One way of removing bacteria,  fungi, and spores from liquids is filtration. What is the pore size of the filter that can remove these microbes?  

• 0.4 Micrometers

• 0.2 Micrometers

• 0.3 Micrometers

• 0.5 Micrometers