Chapter 6 - Microbial Growth Microbiology

Which of the following statements are TRUE?

• Nitrogen-fixing bacteria, such as cyanobacteria, can use atmospheric nitrogen (N2) for their nitrogen source.

• Agar is a polysaccharide derived from plant alga and is used as a solidifying agent in microbiological media since few bacteria can degrade it.

• Aerotolerant anaerobes grow more efficiently anerobically than they do aerobically.

• Facultative anaerobes grow more efficiently aerobically than anaerobically.

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NGSS.HS-LS2-3

Organisms that thrive in high salt environments are classified as ___

• psychrophiles

• halophiles

• hyperthermophiles

• alkalophiles

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NGSS.HS-LS4-4

Many disease causing bacteria grow in communities using a hydrogel to attach to cell surfaces they infect. This hydrogel is known as a _______

• biofilm

• slime mold

• intracellular polymer

• plasmolipid primer

Three cells with a generation time of 30 minutes are inoculated into a culture medium.

How many cells (N_t) are there after 5 hours?

Use the formula: N_t = N₀ x 2ⁿ

• 7290

• 1024

• 3072

• 72.9 million

Which of the following environments are assigned the correct BioSafety Level designation(s)?

• Most introductory microbiology laboratories are a BSL-1.

• a clinical microbiology laboratory working with potentially airborne pathogens, such as tuberculosis bacteria, with a moderate to high risk is BSL-3

• a univesity research laboratory studying organisms that pose a moderate risk, such as influenza and lyme disease, would be considered a BSL-2.

• a laboratory studying the MOST dangerous microorganisms and personnel are required to wear “space suits” is a BSL-3

A(n) _________ is added to neutralize acids.

• buffer

• sucrose solution

• pH probe

• heat source

Which of the following is/are matched correctly?

• 
• 
• 
• 

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NGSS.HS-LS2-3

Bacteria that do NOT use oxygen and usually find it toxic are classified as

• obligate aerobes

• obligate anaerobes

• microtolerant aerobes

• facultative anaerobes

Tags

NGSS.HS-LS2-3

A species of bacterium does not use oxygen, but will grow in its presence is classified as a ____

• microaerophile

• facultative anaerobe

• obligate anaerobe

• obligate aerobe

Tags

NGSS.HS-LS2-3

Which enzyme catalyzes the reaction:

H₂O₂ --> H₂O + O₂

• superoxide dismutase

• oxidase

• peroxidase

• catalase