Microbial Growth: Observation and Requirements

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What is the ideal osmotic pressure condition for microbial survival?

Hyperosmotic environment

Isotonic environment (correct)

Hypertonic environment

Hypotonic environment

Which of the following is an example of a psychrophile?

Bacteria thriving in high-temperature environments

Molds and yeasts thriving in acidic environments

Thermophiles

Organisms that prefer cold temperatures (correct)

What is the main reason microbes need carbon?

To regulate pH levels

To produce energy (correct)

To maintain osmotic pressure

To synthesize proteins

Which of the following statements about temperature preferences of microbes is correct?

Thermophiles prefer high temperatures (C) Signup and view all the answers

What is the effect of unequal osmotic pressure inside and outside a microbial cell?

Cell shrinkage leading to cell death (D) Signup and view all the answers

Which microbial category thrives in high salt environments by balancing osmotic pressure?

Halophiles (C) Signup and view all the answers

What is the primary source of carbon for microbes that are autotrophs?

$CO_2$ (A) Signup and view all the answers

What is the significance of macronutrients for microbial growth?

They act as energy sources for metabolism (A) Signup and view all the answers

Which environmental factor plays a crucial role in determining the growth characteristics of bacteria and molds?

Temperature (A) Signup and view all the answers

What is the term for introducing microbes into a medium?

Inoculum (A) Signup and view all the answers

Which type of media is known for having a varying chemical composition from batch to batch?

Complex media (B) Signup and view all the answers

What is the main purpose of selective media?

Suppress unwanted microbes and encourage growth of desired microbes (C) Signup and view all the answers

Which type of media is considered non-selective and stimulates the growth of various bacterial species?

Enrichment media (C) Signup and view all the answers

What is the process called when bacteria increase in number through cell division?

Binary fission (C) Signup and view all the answers

Which method of measuring microbial growth involves counting cells directly?

Direct microscopic count (B) Signup and view all the answers

What is the term for a population of cells originating from a single cell or group of attached cells?

Colony (A) Signup and view all the answers

What type of media allows differentiation between bacteria within the same group?

Differential media (A) Signup and view all the answers

What is the term used to describe a population of cells from a single cell or group of attached cells?

Colony (C) Signup and view all the answers

Which organic compounds contain nitrogen?

Proteins (D) Signup and view all the answers

Which type of media stimulates the growth of many different types of bacterial species and often exists as liquid?

Enrichment media (C) Signup and view all the answers

Which organic compound contains phosphorus?

Nucleic acids (B) Signup and view all the answers

What are micronutrients also known as?

Trace elements (B) Signup and view all the answers

Which chemicals are usually function as inorganic enzyme cofactors?

Iron, copper, zinc (D) Signup and view all the answers

What is the function of organic growth factors in microbes?

Energy production (B) Signup and view all the answers

What type of microbes grow in liquid (broth) media?

Facultative anaerobes (D) Signup and view all the answers

What are solid media for microbial growth made of?

Agar (C) Signup and view all the answers