Q: In the context of cellular metabolism, which equation correctly represents the hydrolysis of ATP?

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

Q: Which of the following is a correct summary of glycolysis?

$$\text{Glucose} + 2\ \mathrm{NAD}^+ + 2\ \mathrm{ADP} + 2\ \mathrm{P}_i \rightarrow 2\ \text{Pyruvate} + 2\ \mathrm{NADH} + 2\ \mathrm{ATP} + 2\ \mathrm{H}_2\mathrm{O}$$

Question 1

Which of the following best describes the primary function of a biofilm in a natural environment?

Accepted Answer

To provide a semi-solid matrix that protects bacteria and facilitates nutrient exchange

Question 2

Which of the following is a direct result of substrate-level phosphorylation?

Accepted Answer

The transfer of a phosphate group from a substrate to ADP, forming ATP

Question 3

In the context of cellular metabolism, which equation correctly represents the hydrolysis of ATP?

Accepted Answer

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

Question 4

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

Accepted Answer

Oxygen (for all microbes)

Question 5

During aerobic respiration, what is the role of oxygen?

Accepted Answer

It is the terminal electron acceptor, forming water

Question 6

Which of the following best explains why fermentation yields less ATP than aerobic respiration?

Accepted Answer

Fermentation does not involve an electron transport chain or oxidative phosphorylation

Question 7

A bacterium living in an anaerobic environment uses nitrate ($$\mathrm{NO}_3^-) as $$its terminal electron acceptor. This process is best described as:

Accepted Answer

Anaerobic respiration

Question 8

Which of the following statements about catabolism and anabolism is correct?

Accepted Answer

Catabolism breaks down molecules to release energy, while anabolism builds molecules using energy

Question 9

Which of the following is a real-life example of a biofilm?

Accepted Answer

Dental plaque on teeth

Question 10

Which process is responsible for generating the majority of ATP during aerobic respiration?

Accepted Answer

Oxidative phosphorylation via the electron transport chain

Question 11

A chemolithotroph obtains energy from:

Accepted Answer

Inorganic compounds

Question 12

Which of the following best describes the relationship between the electron transport chain and ATP synthase?

Accepted Answer

The electron transport chain creates a proton gradient that drives ATP synthesis via ATP synthase

Question 13

Which of the following is a correct summary of glycolysis?

Accepted Answer

$$	ext{Glucose} + 2\ \mathrm{NAD}^+ + 2\ \mathrm{ADP} + 2\ \mathrm{P}_i ightarrow 2\ 	ext{Pyruvate} + 2\ \mathrm{NADH} + 2\ \mathrm{ATP} + 2\ \mathrm{H}_2\mathrm{O}$$

Question 14

Which of the following is NOT a possible terminal electron acceptor in microbial respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 15

Which of the following best explains why bacteria in a biofilm are often more resistant to antibiotics than planktonic bacteria?

Accepted Answer

The extracellular polymeric substances (EPS) in biofilms limit antibiotic penetration and facilitate communication

Question 16

Which of the following scenarios would most likely require a microbe to use fermentation?

Accepted Answer

A yeast cell in an anaerobic environment converting glucose to ethanol and $$\mathrm{CO}_2$$

Question 17

Which of the following statements about energy acquisition in microbes is correct?

Accepted Answer

Microbes can use a variety of organic and inorganic molecules as energy sources, depending on their enzymes

Question 18

Which of the following best describes the difference between autotrophs and heterotrophs?

Accepted Answer

Autotrophs use CO$$_2 as $$their carbon source, while heterotrophs use organic compounds

Question 19

A bacterium is found living in a hot spring with no oxygen and abundant hydrogen sulfide ($$\mathrm{H}_2\mathrm{S}). $$Which metabolic strategy is it most likely to use?

Accepted Answer

Chemolithotrophy using $$\mathrm{H}_2\mathrm{S} as an $$energy source and an alternative electron acceptor

Microbial Metabolism and Biofilms: Foundations for Microbiology

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