Q: A scientist is comparing the genome, transcriptome, and proteome of a cell. According to the central dogma of molecular biology, which sequence correctly describes the flow of genetic information?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following statements best summarizes the third tenet of the Cell Theory as confirmed by Louis Pasteur's experiments?

Accepted Answer

Cells can only arise by division from a pre-existing cell.

Question 2

Which feature is shared by all cells, both prokaryotic and eukaryotic?

Accepted Answer

Ribosomes for protein synthesis

Question 3

A scientist is comparing the genome, transcriptome, and proteome of a cell. According to the central dogma of molecular biology, which sequence correctly describes the flow of genetic information?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 4

Which of the following best explains why Archaea and Bacteria are classified as separate domains?

Accepted Answer

Archaea and Bacteria differ significantly in their genetic machinery and evolutionary history.

Question 5

Which of the following is a key piece of evidence supporting the endosymbiotic theory for the origin of mitochondria?

Accepted Answer

Mitochondria contain their own circular DNA similar to bacterial DNA.

Question 6

A cell is observed to have a single, circular chromosome, no nucleus, and cell walls containing peptidoglycan. To which group does this cell most likely belong?

Accepted Answer

Bacteria

Question 7

Which of the following best describes the main advantage of electron microscopy over light microscopy?

Accepted Answer

Electron microscopy provides much higher resolution, allowing visualization of structures as small as 0.2 nm.

Question 8

A researcher is studying a newly discovered extremophile that thrives in hot springs. Which domain is this organism most likely to belong to, and why?

Accepted Answer

Archaea, because many extremophiles are classified in this domain.

Question 9

If a spherical cell has a radius of $$2\ \mu m$$, what is its approximate surface area? (Use $$\pi \approx 3.14$$ and $$	ext{Surface Area} = 4 \pi r^2$)

Accepted Answer

$$50.24\ \mu m^2$

Question 10

Which of the following is NOT a feature that distinguishes eukaryotic cells from prokaryotic cells?

Accepted Answer

Presence of ribosomes

Question 11

Which of the following best describes the process of pasteurization as it relates to cell theory?

Accepted Answer

It supports the idea that heat can kill cells, preventing their growth and division.

Question 12

Which of the following statements about the evolutionary relationship between Archaea, Bacteria, and Eukarya is correct?

Accepted Answer

Archaea and Eukarya share more similarities in their genetic machinery than either does with Bacteria.

Question 13

Which of the following is a correct application of the metric scale in cell biology?

Accepted Answer

A ribosome is approximately $$20 nm in $$size.

Question 14

Which of the following is a real-world example of the application of the central dogma of molecular biology?

Accepted Answer

Producing insulin in genetically engineered bacteria by inserting the human insulin gene, which is transcribed and translated into protein.

Question 15

Which of the following statements about model organisms is correct?

Accepted Answer

Model organisms are used because they are easy to manipulate genetically and provide insights applicable to other species.

Question 16

A scientist observes a cell with multiple, linear chromosomes, a nucleus, and mitochondria. Which domain does this cell belong to?

Accepted Answer

Eukarya

Question 17

Which of the following best explains why mitochondria and chloroplasts are considered to have originated from endosymbiotic events?

Accepted Answer

They contain their own DNA and replicate independently of the cell's nucleus.

Question 18

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have multiple, linear chromosomes, while prokaryotic cells have a single, circular chromosome.

Fundamental Units of Life: Cell Biology and Microbial Diversity

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