Question 1

Which of the following statements best explains why prokaryotes are able to survive in extreme environments?

Accepted Answer

Their cell walls are composed of peptidoglycan, which provides structural support.

Question 2

During the Miller-Urey experiment, which simulated early Earth conditions, what was the key finding regarding the origin of life?

Accepted Answer

Amino acids could be synthesized from inorganic molecules under simulated early Earth conditions.

Question 3

Which of the following best describes the structure and function of bacterial endospores?

Accepted Answer

They are protective layers that surround DNA, allowing bacteria to survive harsh conditions.

Question 4

A scientist discovers a prokaryote that uses light as an energy source and carbon dioxide as a carbon source. According to the table of nutritional modes, this organism is best classified as a:

Accepted Answer

Photoautotroph

Question 5

Which of the following is a key difference between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer, while Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.

Question 6

Which of the following best explains the role of ribozymes in the origin of life?

Accepted Answer

Ribozymes are RNA molecules that can act as enzymes, supporting the RNA world hypothesis.

Question 7

A bacterium is observed to move toward a nutrient source. This behavior is best described as:

Accepted Answer

Positive chemotaxis

Question 8

Which of the following is NOT a property of prokaryotic cells?

Accepted Answer

They contain membrane-bound organelles such as mitochondria.

Question 9

Which process allows bacteria to exchange genetic material through direct cell-to-cell contact?

Accepted Answer

Conjugation

Question 10

A bacterium that can survive without oxygen and is killed by its presence is classified as:

Accepted Answer

Anaerobic

Question 11

Which of the following best describes the function of fimbriae in bacteria?

Accepted Answer

They help bacteria attach to surfaces and to each other.

Question 12

Which of the following best explains why some bacteria form capsules?

Accepted Answer

Capsules protect bacteria from phagocytosis and help them adhere to surfaces.

Question 13

A researcher is studying a prokaryote that uses inorganic compounds such as $ \mathrm{H_2S} $ or $ \mathrm{NH_3} $ as an energy source and carbon dioxide as a carbon source. This organism is best classified as a:

Accepted Answer

Chemoautotroph

Question 14

Which of the following statements about the self-replication of RNA is correct?

Accepted Answer

RNA can act as both a template and a catalyst for its own replication.

Question 15

Which of the following is a real-world example of a bacterium using a flagellum?

Accepted Answer

A bacterium swimming toward a sugar source in a wound using its flagellum.

Question 16

Which of the following best describes the composition of the bacterial cell wall?

Accepted Answer

It is composed of peptidoglycan, a polymer of sugars and amino acids.

Question 17

Which of the following is a plausible explanation for why Gram-negative bacteria are often more resistant to antibiotics than Gram-positive bacteria?

Accepted Answer

Gram-negative bacteria have an outer membrane that acts as a barrier to many antibiotics.

Question 18

Which of the following best describes the process by which early cell membranes may have formed?

Accepted Answer

Lipids spontaneously formed into vesicles, creating a boundary that could contain organic molecules.

Question 19

Which of the following is true about the genetic material of most prokaryotes?

Accepted Answer

They have a single, large, circular chromosome.

Question 20

A bacterium that obtains both its energy and carbon from organic compounds is classified as a:

Accepted Answer

Chemoheterotroph

Prokaryotes: Structure, Function, and Diversity

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