Exam 5: Microbial Growth and Control

The death phase applies to individual cells rather than populations.

A bacterium's pH optimum reflects the optimal pH of its intracellular environment.

To determine viable cell counts of a heat-sensitive bacterial isolate,which cell counting method would be best to AVOID?

Defend and explain how FtsZ-type proteins being found in mitochondria and chloroplasts strengthens or weakens the endosymbiosis theory.

Optical density and viable cell concentration are LEAST proportional to each other during

The ratio of the vapor pressure of the air in equilibrium with a substance to the vapor pressure of pure water is known as

A bacterium such as a snow alga that is able to survive a cold temperature is called a psychrophile.

What temperature is most commonly used for autoclaves to sterilize growth media and other devices prior to experimentation?

In general,which group is MOST resistant to radiation?

The activity of MinC and MinD direct whether a bacterial cell will be coccoid or bacillus shaped.

For most purposes of studying bacterial isolates,viable counting usually gives accurate information about the number of active cells present in a culture volume.

In principle,the chemical composition of membranes in obligate acidophiles could be distinguished from neutrophiles.

During elongation of a cell during binary fission,small gaps caused by transglycosylases are formed before cell membrane precursors can be inserted.

Which of the following is/are transferred to daughter cells during cell division?

Which method would be LEAST effective at sterilizing a glass hockey stick to use in the spread-plate method?

Why are microbial doubling times in nature typically longer than those obtained in the laboratory?

Relative to enzymes in mesophilic microorganisms,which of the following is NOT characteristic of enzymes in psychrophiles?

When viable cell concentrations are too high to count on an agar medium,it is most common to use larger sized plates to increase the surface area for counting the colonies.

A halotolerant facultative anaerobic bacterium would grow BEST in a ________ environment.

The process by which two cells arise from one is known as