Q: A bacterium is found to be a chemoautotroph. Which equation best represents its metabolic process?

$$CO_2$$ + \text{inorganic compounds} \rightarrow \text{organic compounds}$$

Question 1

Which of the following best explains why the Miller-Urey experiment was significant in the study of the origin of life?

Accepted Answer

It showed that amino acids could be synthesized from inorganic molecules under early Earth conditions.

Question 2

Which metabolic adaptation allows some prokaryotes to thrive in environments with high temperatures, such as hydrothermal vents?

Accepted Answer

Thermophily

Question 3

A scientist discovers a fossilized stromatolite that is approximately 3.5 billion years old. What does this fossil most likely indicate?

Accepted Answer

Evidence of early oxygenic photosynthesis by cyanobacteria.

Question 4

Which structure is primarily responsible for the movement of prokaryotic cells toward or away from stimuli?

Accepted Answer

Flagella

Question 5

Gram-negative bacteria differ from gram-positive bacteria in which of the following ways?

Accepted Answer

Gram-negative bacteria possess an outer membrane containing lipopolysaccharides.

Question 6

Which of the following best describes the process of binary fission in prokaryotes?

Accepted Answer

Asexual reproduction resulting in two identical daughter cells.

Question 7

A bacterium is found to be a chemoautotroph. Which equation best represents its metabolic process?

Accepted Answer

$$CO_2$$ + 	ext{inorganic compounds} ightarrow 	ext{organic compounds}$$

Question 8

Which of the following mechanisms allows prokaryotes to increase genetic diversity without sexual reproduction?

Accepted Answer

Conjugation via plasmid transfer

Question 9

Which evolutionary group of prokaryotes is responsible for nitrogen fixation in symbiotic relationships with legumes?

Accepted Answer

Rhizobium (Alpha Proteobacteria)

Question 10

Which feature is present in both Archaea and Eukarya, but absent in Bacteria?

Accepted Answer

Methionine as initiator amino acid for protein synthesis

Question 11

A prokaryote is found living in an environment with no oxygen, high temperature, and high methane concentration. Which domain is it most likely to belong to?

Accepted Answer

Archaea

Question 12

Which of the following best describes the role of cyanobacteria in Earth's history?

Accepted Answer

They contributed to the oxygenation of Earth's atmosphere through photosynthesis.

Question 13

Which of the following is NOT a function of the prokaryotic capsule?

Accepted Answer

Movement toward stimuli

Question 14

Which process involves the transfer of genetic material from one prokaryote to another via a virus?

Accepted Answer

Transduction

Question 15

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids are small, circular DNA molecules independent of the chromosome.

Question 16

Which nutritional mode is correctly matched with its energy and carbon source?

Accepted Answer

Chemoheterotroph: organic compounds for both energy and carbon

Question 17

Which of the following best explains why prokaryotes can evolve rapidly?

Accepted Answer

They reproduce asexually via binary fission, leading to high mutation rates and short generation times.

Question 18

Which of the following is a correct comparison of the three domains of life regarding the presence of a nuclear envelope?

Accepted Answer

Absent in Bacteria and Archaea, present in Eukarya

Question 19

A researcher observes a prokaryote with a rod-shaped morphology and a thick peptidoglycan cell wall. Which type of cell is most likely being observed?

Accepted Answer

Gram-positive bacillus

Question 20

Which of the following equations best represents the process of oxygenic photosynthesis performed by cyanobacteria?

Accepted Answer

$$6CO_2 + 6H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2$$

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