Microbial Growth Chapter 6 Clicker Questions

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Which organism is killed by atmospheric oxygen?

Aerotolerant anaerobe

Obligate aerobe

Facultative anaerobe

Obligate anaerobe (correct)

In bacteria, toxic hydrogen peroxide can be broken down into water and oxygen by the enzyme:

Catalase (correct)

Superoxide dismutase

Hydroxylase

Peroxidase

What can be best defined as the time it takes for a cell to divide?

The time it takes for a cell to divide (correct)

The length of time it takes for lag phase

The duration of log phase

How many generations a cell can divide

Bacterial growth is usually graphed using ________ scales.

Logarithmic (semi-logarithmic) Signup and view all the answers

In which growth phase is there intense activity preparing for population growth, but no increase in population?

Lag phase Signup and view all the answers

In which growth phase is there intense activity preparing for population growth, but no increase in population?

Lag phase Signup and view all the answers

Which of the following is NOT a possible reason why exponential growth stops?

Bacteria becoming dormant Signup and view all the answers

In the stationary phase, what happens to microbial deaths and new cell formation?

The number of microbial deaths is equal to the number of new cells formed. Signup and view all the answers

Which type of medium suppresses the growth of unwanted bacteria and encourages growth of desired microbes?

Selective medium Signup and view all the answers

What is the optimum pH for MOST bacteria?

7 Signup and view all the answers

At what temperature would you expect a psychrophile to have its optimal growth?

15°C Signup and view all the answers

What are organisms that require high salt concentrations for growth called?

Obligate Halophiles Signup and view all the answers

What is the primary energy source utilized by primary producers in hydrothermal vents on the ocean floor?

Hydrogen sulfide Signup and view all the answers

Why does the addition of salts preserve foods?

Lower osmotic pressure Signup and view all the answers

What is the optimal temperature for psychrophiles?

+15°C Signup and view all the answers

Which type of organisms prefer acidic environments?

Acidophiles Signup and view all the answers

'Thermophiles' are organisms that thrive in which type of environment?

+50°C - +80°C range Signup and view all the answers

What is the primary purpose of adding salts to preserve foods?

To increase osmotic pressure Signup and view all the answers

From where do chemoautotrophs and photoautotrophs derive their carbon?

Carbon dioxide Signup and view all the answers

What process involves some microorganisms using gaseous nitrogen directly from the atmosphere?

Nitrogen fixation Signup and view all the answers

What do you call an organism that can grow without oxygen but uses it when present?

Facultative anaerobe Signup and view all the answers

Which type of organism is susceptible to being killed by atmospheric oxygen?

Obligate aerobe Signup and view all the answers

What effect does adding salts have on the osmotic pressure of foods?

Increase osmotic pressure Signup and view all the answers

Which compound is the primary source of carbon for chemoautotrophs and photoautotrophs?

Carbon dioxide Signup and view all the answers

What type of organism uses oxygen only when it is present but can grow without it?

Facultative anaerobe Signup and view all the answers

What is the best technique to use to measure the growth of filamentous organisms?

Dry weight Signup and view all the answers

Which method is a statistical estimating technique used to determine the number of bacteria in a sample?

Spread plate method Signup and view all the answers

Starting with one bacterial cell, how many cells would you have after 10 generations?

1024 Signup and view all the answers

Which method is NOT suitable for determining the number of bacteria in a sample?

Dry weight Signup and view all the answers

What is the primary limitation of using turbidity to estimate bacterial numbers?

It overestimates bacterial numbers Signup and view all the answers

Which technique would be most suitable for quantifying bacteria that tend to form colonies and clumps?

Direct microscopic count Signup and view all the answers

What characteristic makes the Most Probable Number method especially useful for low-density bacterial samples?

Ability to estimate very low bacterial counts Signup and view all the answers

What is a potential drawback of using the Spread Plate method compared to direct counts for estimating bacterial numbers?

Increased risk of contamination leading to inaccurate results Signup and view all the answers

Microbial Growth Chapter 6 Clicker Questions

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Questions and Answers

Which organism is killed by atmospheric oxygen?

In bacteria, toxic hydrogen peroxide can be broken down into water and oxygen by the enzyme:

What can be best defined as the time it takes for a cell to divide?

Bacterial growth is usually graphed using ________ scales.

In which growth phase is there intense activity preparing for population growth, but no increase in population?

In which growth phase is there intense activity preparing for population growth, but no increase in population?

Which of the following is NOT a possible reason why exponential growth stops?

In the stationary phase, what happens to microbial deaths and new cell formation?

Which type of medium suppresses the growth of unwanted bacteria and encourages growth of desired microbes?

What is the optimum pH for MOST bacteria?

At what temperature would you expect a psychrophile to have its optimal growth?

What are organisms that require high salt concentrations for growth called?

What is the primary energy source utilized by primary producers in hydrothermal vents on the ocean floor?

Why does the addition of salts preserve foods?

What is the optimal temperature for psychrophiles?

Which type of organisms prefer acidic environments?

'Thermophiles' are organisms that thrive in which type of environment?

What is the primary purpose of adding salts to preserve foods?

From where do chemoautotrophs and photoautotrophs derive their carbon?

What process involves some microorganisms using gaseous nitrogen directly from the atmosphere?

What do you call an organism that can grow without oxygen but uses it when present?

Which type of organism is susceptible to being killed by atmospheric oxygen?

What effect does adding salts have on the osmotic pressure of foods?

Which compound is the primary source of carbon for chemoautotrophs and photoautotrophs?

What type of organism uses oxygen only when it is present but can grow without it?

What is the best technique to use to measure the growth of filamentous organisms?

Which method is a statistical estimating technique used to determine the number of bacteria in a sample?

Starting with one bacterial cell, how many cells would you have after 10 generations?

Which method is NOT suitable for determining the number of bacteria in a sample?

What is the primary limitation of using turbidity to estimate bacterial numbers?

Which technique would be most suitable for quantifying bacteria that tend to form colonies and clumps?

What characteristic makes the Most Probable Number method especially useful for low-density bacterial samples?

What is a potential drawback of using the Spread Plate method compared to direct counts for estimating bacterial numbers?

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