Question 1

Which of the following best describes a heterotroph in terms of its carbon source?

Accepted Answer

Uses organic molecules as its carbon source

Question 2

Which element is NOT considered one of the six essential macronutrients for bacterial cells?

Accepted Answer

Iron

Question 3

A bacterial cell placed in a hypertonic solution will most likely:

Accepted Answer

Shrink as water diffuses out of the cell

Question 4

Which process is illustrated by the movement of molecules from high to low concentration, as shown in the image with blue arrows?

Accepted Answer

Diffusion

Question 5

Facilitated diffusion differs from simple diffusion because:

Accepted Answer

It uses membrane proteins to transport substances

Question 6

Which of the following is a feature of active transport, as shown in the image with ATP?

Accepted Answer

Requires energy input, often from ATP

Question 7

Phagocytosis and pinocytosis are types of:

Accepted Answer

Active transport involving endocytosis

Question 8

Which microbial group grows optimally at temperatures above 45$$^	ext{o}C$$?

Accepted Answer

Thermophiles

Question 9

A microbe that can survive in the cold but has an optimum growth temperature between 15$$^	ext{o}C $$and 30$$^	ext{o}C is $$called:

Accepted Answer

Psychrotolerant

Question 10

Which technique is used to culture strict anaerobes, as shown in the image with a sealed container and gas generator?

Accepted Answer

Use of an anaerobic chamber with oxygen scavenging

Question 11

In a commensal relationship, as illustrated by the fish and its companion, which statement is true?

Accepted Answer

One organism benefits, the other is neither harmed nor helped

Question 12

During binary fission, which step immediately follows chromosome replication?

Accepted Answer

Protein band forms in the center of the cell

Question 13

If a bacterial population doubles every 30 minutes, how many cells will there be after 3 hours, starting from a single cell? Use $$N = N_0$ 	imes 2^n$$, where $$n is $$the number of generations.

Accepted Answer

$$N = 1 	imes 2^6$ = 64$$

Question 14

Which method allows for the electronic counting of bacterial cells in a liquid sample, as shown in the image with an automatic counter?

Accepted Answer

Coulter counter

Question 15

Which phase of the bacterial growth curve is characterized by rapid cell division and maximum metabolic activity?

Accepted Answer

Log (exponential) phase

Question 16

A halophile is best described as an organism that:

Accepted Answer

Requires high concentrations of salt for growth

Question 17

Which enzyme is responsible for neutralizing superoxide ions in aerobic bacteria?

Accepted Answer

Superoxide dismutase

Question 18

Which of the following is a real-world application of hypertonic environments in microbiology?

Accepted Answer

Preserving food with concentrated salt or sugar solutions

Question 19

Which microbial association is characterized by both organisms benefiting, but the relationship is not obligatory for survival?

Accepted Answer

Synergism

Question 20

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water across a selectively permeable membrane

Microbial Nutrition and Growth: Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards