17 Questions
What is the purpose of observing a culture medium in the lab?
To observe microbial growth
What happens if the osmotic pressure is not equal inside and outside a cell?
The cell will shrink or swell
Which type of microbe thrives at low temperatures?
Psychrophiles
Which of the following chemicals is considered a macronutrient required by microbes in large quantities?
Sulfur
What is the primary source of carbon for autotrophic microbes?
CO2
How do halophiles survive in high-salt environments?
They produce negatively-charged solutes to balance osmotic pressure
Which organic compounds contain nitrogen?
Proteins
What organic compounds contain sulfur?
Proteins
Which type of microbes can grow in the absence of oxygen?
Facultative anaerobes
What are micronutrients also known as?
Trace elements
Which type of culture media appears as a solid preparation for microbial growth?
Agar media
What is the difference between a colony and a pure culture?
A colony is a population of cells from a single cell or group, while a pure culture contains only one species.
Which type of media requires the removal of all available O2 and is used for anaerobic bacteria growth?
Reducing media
What is the main purpose of selective media in bacterial culture?
To suppress unwanted microbes and encourage growth of desired microbes.
Which type of media allows for the differentiation between bacteria within the same group?
Differential media
What is the process by which bacterial growth occurs through cell division?
Binary fission
What method of measuring microbial growth involves indirect measurements like turbidity and metabolic activity?
Plate count
Test your knowledge on microbial growth, bacterial growth, colony formation, and the physical and chemical requirements for microbial growth. Questions cover topics such as temperature, pH, osmotic pressure, macronutrients, micronutrients, and oxygen requirements.
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