Q: Which of the following equations correctly represents the net ATP yield from glycolysis during fermentation in prokaryotic cells?

$$2\ \text{ADP} + 2\ \text{P}_i + \text{glucose} \rightarrow 2\ \text{ATP} + 2\ \text{pyruvate} + 2\ \text{NADH}$$

Q: Which of the following best explains why fermentation is important for some microorganisms?

Fermentation regenerates $$\text{NAD}^+$$, allowing glycolysis to continue in the absence of oxygen.

Question 1

Which of the following best describes the main difference in the location of cellular respiration between prokaryotic and eukaryotic cells?

Accepted Answer

In prokaryotes, cellular respiration occurs in the cytoplasm and across the plasma membrane, while in eukaryotes, it occurs mainly in the mitochondria.

Question 2

A patient with a wound infection is found to have bacteria growing in the absence of oxygen, but the bacteria do not die when exposed to oxygen. Which oxygen requirement category best describes these bacteria?

Accepted Answer

Aerotolerant anaerobes

Question 3

Which of the following equations correctly represents the net ATP yield from glycolysis during fermentation in prokaryotic cells?

Accepted Answer

$$2\ 	ext{ADP} + 2\ 	ext{P}_i + 	ext{glucose} ightarrow 2\ 	ext{ATP} + 2\ 	ext{pyruvate} + 2\ 	ext{NADH}$$

Question 4

Which of the following best explains why fermentation is important for some microorganisms?

Accepted Answer

Fermentation regenerates $$	ext{NAD}^+$$, allowing glycolysis to continue in the absence of oxygen.

Question 5

A bacterium that uses organic compounds as both its carbon and energy source is classified as which of the following?

Accepted Answer

Chemoheterotroph

Question 6

Which phase of the bacterial growth curve is characterized by a balance between cell division and cell death, resulting in no net increase in cell number?

Accepted Answer

Stationary phase

Question 7

A microbiologist wants to estimate the number of viable bacteria in a sample. Which method should they use to obtain a direct count of living cells?

Accepted Answer

Plate count method

Question 8

Which of the following best describes a biofilm?

Accepted Answer

A complex community of microorganisms attached to a surface and embedded in a self-produced extracellular matrix.

Question 9

Which temperature category would best describe a bacterium that grows optimally at $$37^\circ	ext{C}$$, such as most human pathogens?

Accepted Answer

Mesophile

Question 10

During DNA replication in prokaryotic cells, where does the process primarily occur?

Accepted Answer

In the cytoplasm

Question 11

Which of the following statements correctly compares the DNA structure of prokaryotes and eukaryotes?

Accepted Answer

Prokaryotic DNA is typically circular and not associated with histones, while eukaryotic DNA is linear and wrapped around histones.

Question 12

Which of the following correctly lists the steps of protein synthesis in the correct order?

Accepted Answer

Transcription, then translation

Question 13

A scientist observes that a bacterial population doubles every 30 minutes during the log phase. If the initial population is $$1 	imes 10^3$ cells, how many cells will there be after 2 hours?

Accepted Answer

$$1.6 	imes 10^4$

Question 14

Which of the following is an example of horizontal gene transfer in bacteria?

Accepted Answer

Conjugation

Question 15

Which of the following best explains why obligate anaerobes are unable to survive in the presence of oxygen?

Accepted Answer

They lack enzymes such as superoxide dismutase and catalase to detoxify reactive oxygen species.

Question 16

Which of the following best describes the process of DNA replication in eukaryotic cells?

Accepted Answer

It occurs in the nucleus and involves multiple origins of replication.

Question 17

A researcher is studying a bacterium that can grow in the presence or absence of oxygen, but grows better when oxygen is present. Which term best describes this organism?

Accepted Answer

Facultative anaerobe

Question 18

Which of the following best describes the role of ribosomes in protein synthesis?

Accepted Answer

They facilitate the translation of mRNA into a polypeptide chain.

Question 19

Which of the following is a chemical requirement for microbial growth that is needed for the synthesis of amino acids and nucleic acids?

Accepted Answer

Nitrogen

Question 20

A hospital-acquired infection is traced to a biofilm on a catheter. Which property of biofilms most contributes to their resistance to antibiotics?

Accepted Answer

The extracellular matrix limits antibiotic penetration and facilitates communication between cells.

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