Q: Which of the following equations correctly represents the hydrolysis of ATP to ADP?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following best describes the main difference between binary fission and budding in bacterial reproduction?

Accepted Answer

Binary fission produces two identical daughter cells, while budding produces a smaller daughter cell that grows from the parent.

Question 2

Which bacterial genus is well-known for using endospores as a means of asexual reproduction and survival in harsh conditions?

Accepted Answer

Bacillus

Question 3

During which phase of the bacterial growth curve in a closed batch system does the population size remain constant due to a balance between cell division and cell death?

Accepted Answer

Stationary phase

Question 4

Why might the four classic stages of bacterial growth not occur in natural environments?

Accepted Answer

Nutrient levels and waste removal are not constant in nature, preventing predictable growth phases.

Question 5

A microbe that grows optimally at $$15^\circ C$$ but can survive at $$0^\circ C is $$best classified as a:

Accepted Answer

Psychrophile

Question 6

Which of the following best explains why most microbes cannot survive in high-salt environments?

Accepted Answer

High salt causes water to leave the cell via osmosis, leading to plasmolysis.

Question 7

Which of the following statements about obligate anaerobes is correct?

Accepted Answer

They are killed by exposure to oxygen due to the accumulation of reactive oxygen species (ROS).

Question 8

Reactive oxygen species (ROS) are dangerous to cells because:

Accepted Answer

They damage cellular components such as DNA, proteins, and lipids.

Question 9

Which physical method of decontamination is most effective for sterilizing heat-sensitive medical equipment?

Accepted Answer

Filtration

Question 10

Which of the following best describes the difference between sterilization and disinfection?

Accepted Answer

Sterilization destroys all forms of microbial life, while disinfection reduces or eliminates most pathogens but not necessarily all microbes.

Question 11

Which of the following chemical agents is most effective against endospores?

Accepted Answer

Aldehydes

Question 12

Which of the following best describes an amphibolic pathway?

Accepted Answer

A pathway that can function in both catabolic and anabolic processes, such as the Krebs cycle.

Question 13

Which of the following equations correctly represents the hydrolysis of ATP to ADP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 14

Which of the following best explains how enzymes speed up chemical reactions?

Accepted Answer

They lower the activation energy required for the reaction to proceed.

Question 15

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and blocking substrate binding.

Question 16

During glycolysis, which of the following is the net gain of ATP per molecule of glucose?

Accepted Answer

$$2$$ ATP

Question 17

Which of the following best describes the difference between an emerging and a reemerging infectious disease?

Accepted Answer

Emerging diseases are newly identified or increasing in incidence, while reemerging diseases were previously under control but are now increasing again.

Question 18

Which of the following best defines the term 'ID50'?

Accepted Answer

The infectious dose required to infect 50% of a test population.

Question 19

Which of the following is a property unique to endotoxins compared to exotoxins?

Accepted Answer

They are part of the outer membrane of Gram-negative bacteria and are released upon cell lysis.

Question 20

A pathogen that avoids immune detection by covering its surface with host molecules is using which strategy?

Accepted Answer

Antigen masking

MMBS111 Unit 3 Microbiology Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards