$$\text{Growth Rate} = k \cdot e$$^{-\frac{E_a}$${RT}}$$

Question 1

Which of the following best describes the difference between autotrophs and heterotrophs in terms of their carbon source?

Accepted Answer

Autotrophs use carbon dioxide as their carbon source, while heterotrophs use organic compounds.

Question 2

A bacterium isolated from a hot spring grows optimally at 75°C. Which term best describes this organism?

Accepted Answer

Thermophile

Question 3

Which of the following statements about obligate anaerobes is correct?

Accepted Answer

They are killed by oxygen.

Question 4

A microbe that grows equally well throughout a tube of thioglycollate medium is most likely a(n):

Accepted Answer

Aerotolerant anaerobe

Question 5

Which of the following growth factors is correctly matched with its function?

Accepted Answer

NADH – electron carrier

Question 6

Which equation best represents the relationship between osmotic pressure and water movement across a cell membrane?

Accepted Answer

$$\pi = iMRT$$

Question 7

A bacterium that grows best at a pH of 9.5 is classified as a(n):

Accepted Answer

Alkalinophile

Question 8

Which of the following is NOT a chemical requirement for microbial growth?

Accepted Answer

Hydrostatic pressure

Question 9

Which of the following best describes the streak plate method?

Accepted Answer

It is used to obtain a pure culture by spreading a diluted sample over the surface of an agar plate.

Question 10

A scientist wants to isolate a single colony from a mixed culture. Which technique should they use?

Accepted Answer

Pour plate method

Question 11

Which of the following statements about photoheterotrophs is correct?

Accepted Answer

They use organic compounds as their carbon source and light as their energy source.

Question 12

Which of the following best explains why water is essential for microbial growth?

Accepted Answer

Water is required for all metabolic reactions and acts as a solvent for nutrients.

Question 13

A clinical specimen is collected from a patient’s cerebrospinal fluid. What is the most appropriate collection method?

Accepted Answer

Needle aspiration from subarachnoid space

Question 14

Which of the following is a trace element required in small amounts for microbial growth?

Accepted Answer

Iron

Question 15

A microbe that can grow in the presence or absence of oxygen but grows better with oxygen is classified as a(n):

Accepted Answer

Facultative anaerobe

Question 16

Which of the following best describes the function of NADH in microbial metabolism?

Accepted Answer

It is an electron carrier in the electron transport chain.

Question 17

Which of the following equations best describes the relationship between temperature and microbial growth rate?

Accepted Answer

$$	ext{Growth Rate} = k \cdot e$$^{-\frac{E_a}$${RT}}$$

Question 18

Which of the following best describes a colony forming unit (CFU)?

Accepted Answer

A single cell or group of related cells that gives rise to a colony.

Question 19

Which of the following is a real-life application of the pour plate method?

Accepted Answer

Isolating and counting viable bacteria in a water sample.

Question 20

A bacterium that bursts when placed in a hypotonic solution likely lacks which structure?

Accepted Answer

Cell wall

Microbial Nutrition and Growth: Study Notes

Study Guide - Practice Questions