Exam 7: Microbial Nutrition, Ecology, and Growth

In the viable plate count method, a measured sample of a culture is evenly spread across an agar surface and incubated.Each _____ represents one _____ from the sample.

The direct cell count, using a cytometer, can quantitate viable cell numbers from a sample.

The time that it takes for a freshly inoculated agar culture to develop visible colonies is principally governed by that species generation time.

An organic nutrient that cannot be synthesized by the organism and must be provided is called a/an:

An organism that uses CO₂ for its carbon needs would be called a/an _____.

A halophile would grow best in:

You inoculate a culture into a test tube containing broth and take it out of the incubator the next day.You see the culture is growing equally throughout the broth.You conclude the culture must be:

Organisms that feed on dead organisms for nutrients are called:

You inoculate a culture into a test tube containing broth and take it out of the incubator the next day.You see the culture is growing at the bottom of the tube.You conclude the culture must be:

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with:

Which of the following microorganisms would find hypotonic conditions most detrimental?

Compare and contrast the direct cell count and the viable plate method for analyzing bacterial numbers.Include a discussion of the procedure used in each method.

Most microorganisms on earth can only live and survive in habitats that are similar to human body conditions.

The stage in a normal growth curve when cells reach the maximum rate of cell division is the:

The majority of organisms live or grow in habitats between:

The type of photosynthesis that does not produce oxygen:

An organism that grows slowly in the cold but has an optimum growth temperature of 32°C is called a/an:

The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called:

An important mineral ion of the cytochrome pigments of cellular respiration is:

Choose an area of the body where biofilm is present and identify the kinds of bacteria present.Be sure to describe their nutritional and environmental requirements along with their niche.