Question 1

Which of the following best describes a micronutrient in bacterial cells?

Accepted Answer

A substance present in small amounts, involved in enzyme function and protein structure

Question 2

A bacterium is placed in a solution with a higher solute concentration than its cytoplasm. What is the expected effect on the cell?

Accepted Answer

Water will leave the cell, causing it to shrink and undergo plasmolysis

Question 3

Which equation correctly calculates the total number of cells in a bacterial population after n generations, starting with N₀ cells?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 4

Which of the following organisms is most likely to cause food-borne illness at refrigerator temperatures?

Accepted Answer

Staphylococcus aureus

Question 5

A microbe that uses inorganic CO₂ as its carbon source and sunlight as its energy source is classified as a:

Accepted Answer

Photoautotroph

Question 6

Which of the following is an example of passive transport in microbial cells?

Accepted Answer

Facilitated diffusion

Question 7

Which essential nutrient is a key component of nucleic acids and ATP, and is mainly derived from phosphate minerals?

Accepted Answer

Phosphorus

Question 8

A bacterium that cannot grow without oxygen and possesses enzymes to detoxify oxygen by-products is classified as:

Accepted Answer

Obligate aerobe

Question 9

Which of the following associations between microbes is characterized by both organisms benefiting, but the relationship is not obligatory for survival?

Accepted Answer

Synergism

Question 10

During which phase of the bacterial growth curve are cells most susceptible to antimicrobial agents?

Accepted Answer

Exponential (log) phase

Question 11

Which of the following best describes the process of osmosis in microbial cells?

Accepted Answer

Diffusion of water through a selectively permeable membrane

Question 12

A bacterium isolated from a hot spring with an optimal growth temperature of 90°C is most likely a(n):

Accepted Answer

Extreme thermophile

Question 13

Which enzyme is responsible for converting superoxide ion ($$O_2$$^-$$) into hydrogen peroxide (H_2O_2$) in microbial cells?

Accepted Answer

Superoxide dismutase

Question 14

A microbe that thrives in acidic environments, such as coal piles with a pH of 1, is classified as a(n):

Accepted Answer

Acidophile

Question 15

Which of the following is a correct statement about saprobes?

Accepted Answer

They recycle organic nutrients by decomposing dead matter

Question 16

Which of the following is NOT a characteristic of biofilms compared to planktonic bacteria?

Accepted Answer

Biofilms are less likely to communicate via quorum sensing

Question 17

A facultative anaerobe is best described as an organism that:

Accepted Answer

Can use oxygen when present but can also grow without it

Question 18

Which of the following nutrients is essential for the formation of disulfide bonds in proteins?

Accepted Answer

Sulfur

Question 19

A bacterial population starts with 100 cells and has a generation time of 30 minutes. How many cells will there be after 2 hours of exponential growth?

Accepted Answer

1600

Question 20

Which of the following transport mechanisms requires energy expenditure by the cell?

Accepted Answer

Carrier-mediated active transport

Microbial Nutrition and Growth: Chapter 6 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard