Factors Affecting Growth of Microorganisms in Foods Quiz

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What does the exponential growth model describe?

The kinetics of microbial growth over time

The kinetics of microbial inactivation over time

The shape of the growth curve (correct)

The specific growth rate of microorganisms

In the exponential growth model, what does N(t) represent?

The specific growth rate

The time elapsed

The final microbial population (correct)

The initial microbial population

What is the specific growth rate (μ) in the exponential growth model measured in?

Degrees Celsius

Microbial population size

pH units

Time^-1 (correct)

In the exponential growth model, what happens to the microbial population if the specific growth rate (μ) increases?

Population growth accelerates Signup and view all the answers

If a food product is inoculated with 200 CFU/g of a bacterium and undergoes exponential growth with μ = 0.15 per hour, what is the microbial population after 4 hours of incubation?

240 CFU/g Signup and view all the answers

Which of the following factors affect the rate of microbial growth in the exponential growth model?

Temperature only Signup and view all the answers

What is the primary reason for the low growth rate of large cells?

Difficulty in transporting nutrients into the cell Signup and view all the answers

During which phase do microorganisms adapt to their environment?

Lag phase Signup and view all the answers

What is the characteristic of the stationary phase?

Growth rate equals death rate Signup and view all the answers

Which factor affects microbial growth and survival in food?

A combination of intrinsic, extrinsic, and implicit factors Signup and view all the answers

What happens to the microbial population in the death phase?

It decreases due to various factors Signup and view all the answers

What is the graph that represents the growth of microorganisms?

Logarithmic graph Signup and view all the answers

What is the primary way that microorganisms increase their population?

Through the increase in the number of cells or population Signup and view all the answers

What is the result of a single-cellular microbe dividing into two new cells during one growth cycle?

A 100% increase in cell number Signup and view all the answers

Why do bacteria have a high rate of metabolism and growth?

Due to their high surface area to volume ratio Signup and view all the answers

What is the advantage of small cell size in terms of nutrient exchange?

They can easily exchange nutrients and remove end-products Signup and view all the answers

What happens to the surface area to volume ratio of a cell as it ages?

It decreases Signup and view all the answers

What type of cell division is common in yeast?

Budding Signup and view all the answers