MCQ on Archaebacteria with Answers (PDF)







Archaebacteria, or archaea, are a group of single-celled microorganisms distinct from bacteria and eukaryotes. They thrive in extreme environments like hot springs, salt lakes, and deep-sea vents. Unlike bacteria, archaea have unique cell membranes and genetic material. They lack peptidoglycan in their cell walls, which sets them apart from true bacteria. Archaea play a crucial role in ecosystems, especially in breaking down organic matter in anaerobic conditions. They’re also significant in evolutionary studies, representing an ancient lineage of life. This is an MCQ on Archaebacteria with answers. You can download the questions as PDF from the download link provided in the results page of this quiz.

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1. 
Which of the following is a unique characteristic of archaebacteria that distinguishes them from eubacteria?

2. 
Which of the following is NOT a typical habitat for archaebacteria?

3. 
Which of the following groups of archaebacteria is known for thriving in extremely high-temperature environments?

4. 
Archaebacteria are known for their ability to perform unique metabolic processes. Which of the following processes is primarily associated with methanogens?

5. 
Which of the following statements correctly describes the genetic material of archaebacteria?

6. 
The ribosomal RNA (rRNA) of archaebacteria is most closely related to which of the following domains of life?

7. 
Which type of archaebacteria is known to live in highly saline environments, such as salt lakes and salt mines?

8. 
How do archaebacteria differ from eubacteria in terms of RNA polymerase?

9. 
Which of the following statements is true about the role of archaebacteria in the carbon cycle?

10. 
Which of the following is an example of an extremophilic archaeon that thrives in acidic conditions?

11. 
Archaebacteria possess a unique coenzyme, coenzyme M, involved in which metabolic process?

12. 
In archaebacteria, the S-layer is an important structural component of the cell envelope. What is its primary function?

13. 
Which of the following molecular features is absent in archaebacteria, differentiating them from eukaryotes?

14. 
How do archaebacteria contribute to the nitrogen cycle, particularly in extreme environments?

15. 
Which of the following is a distinguishing feature of the archaeal ribosome compared to bacterial ribosomes?

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