Micro chapter 6

Organisms that grow best at temperatures close to that of the human body are known as thermophiles.

Most bacteria including those that affect humans grow best at a pH level at or near 2.0-4.0.

Osmotic loss of water is referred to as desiccation.

Carbon makes up about how much of a bacterium's dry weight?

Carbon is a basic building block for all life including bacteria.

When hydrogen peroxide is added to a microbial colony of catalase-producing bacteria the color will change to blue.

The carbon cycle refers to the flow of carbon between

Obligate aerobes do not require large amount of O2 to thrive.

Disease caused by anaerobes can develop in surgical wounds.

Microbes vary in their requirements for growth factors.

During the lag phase of microbial growth, microbes are most vulnerable to unfavorable environmental conditions.

E. coli has a doubling time of 2 weeks.

Autoinducers and pheromones are factors associated with generation time.

Quorum-sensing helps bacteria to congregate into nearly solid masses that act as barriers to sterilization called purines.

Filtration is the most commonly used method of measuring bacterial population size.

Desiccator chambers are used in which method of bacterial counting?

Turbidity is the measure of how cloudy or hazy a liquid sample appears.

Turbidity is not applicable to bacteria that do not clump.