Microbial Cell Shape Determination Quiz

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What role does the cellular location of peptidoglycan synthesis play in determining cell shape?

Peptidoglycan forms only at the central septum (correct)

Peptidoglycan synthesis is unrelated to cell shape

Peptidoglycan forms primarily at the poles

Peptidoglycan is synthesized randomly across the cell membrane

What is the role of FtsZ localization placement in cell shape determination?

It plays a role in guiding cell division at the central septum (correct)

It creates filaments along the plasma membrane

It helps in growth at the cell poles

It is involved in peptidoglycan synthesis at the poles

In a microbial growth curve, what phase follows the lag phase?

Exponential (log) phase (correct)

Death phase

Stationary phase

Decline phase

What defines population growth in microbial cultures?

Increase in cell size and number simultaneously Signup and view all the answers

What type of culture involves incubation in a closed vessel with a single batch of medium?

Batch culture Signup and view all the answers

How is the microbial growth curve typically plotted for microorganisms cultivated in liquid culture?

Logarithm of cell number versus time Signup and view all the answers

Which method involves spreading a diluted sample of bacteria over a solid agar surface or pouring it into a Petri plate?

Standard Plate Counts Signup and view all the answers

What is the primary purpose of the membrane filter method in microbiology?

Trapping bacteria from aquatic samples Signup and view all the answers

Which technique is most suitable for determining the number of bacteria in a sample based on colonies grown on a membrane?

Membrane Filter Method Signup and view all the answers

What is one key parameter to consider when aiming to control or encourage microbial growth?

pH level Signup and view all the answers

In microbiology, what does CFU stand for?

Colony Forming Units Signup and view all the answers

What is the main advantage of the membrane filter method over the standard plate counts technique?

Higher sensitivity Signup and view all the answers

What is the purpose of spread plate method in microbiology?

To evenly spread a small volume of diluted mixture over an agar plate Signup and view all the answers

Why does the pour plate method use liquid agar?

To facilitate mixing of the sample with agar before pouring into dishes Signup and view all the answers

In microbial population size measurement, why are plate count results expressed in terms of colony forming units (CFUs)?

To avoid direct counting of individual microbes Signup and view all the answers

What is the purpose of direct counts and membrane filter technique in measuring microbial growth?

To estimate total microbial population size directly Signup and view all the answers

Which technique is most suitable for measuring changes in cell mass during microbial growth?

Cell mass measurements Signup and view all the answers

What is the main advantage of using viable counting methods for measuring microbial growth?

Focus on counting viable and culturable cells Signup and view all the answers