MCQ on Mycoplasma with Answers for NEET Pdf
MCQ on Mycoplasma with Answers Pdf: Mycoplasmas are certainly the most serious and widespread of all biological contaminants. This is due to its low detection rate and its destructive effect on mammalian cells. They belong to the class of Mollicutes, whose main characteristic is the lack of cell wall and its plasma-like shape. They are much smaller than most bacteria (0.15 to 0.3 µm), so they can grow to very high densities with no visible signs.
In other words, they are difficult to identify even with a high-powered electron microscope. Thus, the small size is the main reason for its leakage through filtration systems used in sterilization. Finally, because the most common antibiotics target bacterial cell walls, mycoplasmas are highly resistant. They are highly infectious for all types of eukaryotic cells, including primary cells. These microorganisms have a great limitation to synthesize components for their metabolism.
Therefore, they need host cell components for their replication and survival. This makes them extremely harmful to any cell culture, as they alter cell functions, such as metabolism and cell growth, triggering cytopathic responses and leading to cell death. After adhesion or fusion with the host cell membrane, therefore, they can cause more damage to the cell, interfering with signaling cascades and cytokine production.
Here below we listed MCQ on Mycoplasma with Answers Pdf Gear up for your Exam Preparation with top and good. Multiple Choice Questions on Mycoplasma and Cell biology are also recommended by toppers, making it easier for you to score more in Exams like NEET.
MCQ on Mycoplasma with Answers for NEET Pdf
1. Mycoplasma is referred as___________
(a) Eukaryotic and unicellular organisms
(b) Prokaryotic and unicellular organisms
(c) Prokaryotic and multicellular organisms
(d) Eukaryotic and multicellular organisms
Answer: (b) Prokaryotic and unicellular organisms
Explanation: Mycoplasmas are the smallest prokaryotic organisms capable of independent growth and reproduction.
2. Mycoplasma is also known as_______________
(a) Pleuropneumonia-like organisms (PPLO)
(b) Cell Wall-less Organisms
(c) Only B
(d) None of these
Answer: (a) Pleuropneumonia-like organisms (PPLO)
Explanation: Mycoplasmas are historically referred to as PPLO due to their discovery in cases of pleuropneumonia.
Read: Structural Organization MCQ
3. The inflammatory disease of pelvic is caused due to the_________
(a) Mycoplasma pneumoniae
(b) Mycoplasma hominis
(c) Mycobacterium leprae
(d) Mycolasma
Answer: (b) Mycoplasma hominis
Explanation: Mycoplasma hominis is associated with pelvic inflammatory disease (PID) in humans.
Read: Fertilization MCQ
4. Mycoplasmas are free-living and small organisms having a size of approximately_______
(a) 0.5 µm
(b) 0.4 µm
(c) 0.3 µm
(d) 0.2 µm
Answer: (c) 0.3 µm
Explanation: Mycoplasmas are extremely small bacteria, about 0.3 micrometers in diameter.
Read: Strain Improvement MCQ
5. Which of the following substances is required for the growth of Mycoplasmas?
(a) Nitrogen
(b) Carbon
(c) Cholesterol
(d) Glucose
Answer: (c) Cholesterol
Explanation: Mycoplasmas need cholesterol to maintain their plasma membrane integrity.
Read: Sterlization MCQ
6. The “witches’ broom” of legumes is caused due to the ________
(a) Protozoa
(b) Virus
(c) Mycoplasma
(d) Bacteria
Answer: (c) Mycoplasma
Explanation: Mycoplasmas infect the phloem of plants, causing witches’ broom-like deformities.
7. Which of the following mycoplasma species causes human sterility_________
(a) T. mycoplasma
(b) M. fermentans
(c) M. hominis
(d) All of the above
Answer: (d) All of the above
Explanation: Several Mycoplasma species including T. mycoplasma, M. fermentans, and M. hominis have been linked to infertility.
8. In mycoplasma, the elementary cell body performs the function of_________
(a) Respiration
(b) Reproduction
(c) Excretion
(d) Metabolism
Answer: (b) Reproduction
Explanation: The elementary bodies of mycoplasma are involved in their reproduction.
9. Which of the following is called “Jokers of the plant kingdom”?
(a) Nostoc
(b) Mycoplasma
(c) Bacteria
(d) None of the above
Answer: (b) Mycoplasma
Explanation: Mycoplasmas are called “Jokers” due to their variable shapes (pleomorphism).
10. These are osmotically inactive_________
(a) Nostoc
(b) Mycoplasma
(c) Bacteria
(d) All of these
Answer: (b) Mycoplasma
Explanation: Mycoplasmas are osmotically inactive due to the absence of a rigid cell wall.
11. The smallest cells of mycoplasmas are about ___________ in diameter.
(a) 1 micrometer
(b) 0.3 micrometer
(c) 5 micrometer
(d) 1 meter
Answer: (b) 0.3 micrometer
Explanation: Mycoplasmas are the smallest known free-living organisms.
12. The colonies of Mycoplasmas on agar plate can be observed using a______________
(a) Low-power microscope
(b) High-power microscope
(c) Phase contrast microscopy
(d) Bright-field microscopy
Answer: (a) Low-power microscope
Explanation: Mycoplasma colonies are small and appear under low-power microscopes.
13. What type of colonies are formed by Mycoplasmas on the agar plate?
(a) Colorless
(b) Colored
(c) Lawn formation
(d) Fried-egg
Answer: (d) Fried-egg
Explanation: Mycoplasma colonies have a distinctive central dense area, resembling a fried egg.
14. Vancomycin and Penicillin do not affect the mycoplasma as___________
(a) There is no Golgi body
(b) There are no mitochondria
(c) There is no nucleus
(d) There is no cell wall
Answer: (d) There is no cell wall
Explanation: These antibiotics target cell walls, which Mycoplasmas lack.
15. In which of the following microorganisms is the cell wall absent?
(a) Cyanobacteria
(b) Mycoplasma
(c) Viroid
(d) Virus
Answer: (b) Mycoplasma
Explanation: Mycoplasmas are unique bacteria that lack a cell wall entirely.
16. The disease Little leaf of brinjal is caused due to the__________
(a) Algae
(b) Fungus
(c) Mycoplasma
(d) Virus
Answer: (c) Mycoplasma
Explanation: Mycoplasma infection in plants leads to the “little leaf” disease, notably in brinjal.
17. The smallest organism capable of autonomous growth and reproduction is_________
(a) Mycoplasma
(b) Viroid
(c) Virus
(d) None of these
Answer: (a) Mycoplasma
Explanation: Mycoplasmas are the smallest self-replicating prokaryotes.
18. Which character applies to Mycoplasma?
(a) They pass through bacteria-proof filter paper.
(b) They are osmotically inactive.
(c) They require sterol for organ growth.
(d) All of the above.
Answer: (d) All of the above
Explanation: Mycoplasmas have small size, no cell wall, are osmotically inactive, and require sterol.
19. PPLO is also known as_______
(a) Variola
(b) Eaton Agents
(c) Pathogens
(d) None of the above
Answer: (b) Eaton Agents
Explanation: Eaton agents were early names for PPLO that caused atypical pneumonia.
20. Which of the following features does Mycoplasma not have?
(a) Pleomorphic
(b) Lacks cell wall
(c) All are correct
(d) Cannot live without oxygen
Answer: (d) Cannot live without oxygen
Explanation: Mycoplasmas are facultative anaerobes, so they can survive without oxygen.
21. Which of these bacteria is resistant to Penicillin as it lacks a cell wall?
(a) Spirochetes
(b) Cyanobacteria
(c) Mycoplasmas
(d) Bdellovibrios
Answer: (c) Mycoplasmas
Explanation: Penicillin targets peptidoglycan, absent in Mycoplasmas due to lack of cell wall.
22. Cell wall is absent in?
(a) Mycoplasma
(b) Gametes
(c) Animal cells
(d) All of the above
Answer: (d) All of the above
Explanation: All these cells lack a rigid cell wall structure.
23. Which of the following statements about Mycoplasma is not true?
(a) They cause diseases in plants
(b) They are pleomorphic
(c) They are sensitive to penicillin
(d) They are also called PPLO
Answer: (c) They are sensitive to penicillin
Explanation: Mycoplasmas are resistant to penicillin due to absence of cell wall.
24. Mycoplasma are organisms that completely lack a cell wall. These are__________
(a) Obligate Aerobe
(b) Facultative Anaerobe
(c) Obligate Anaerobe
(d) Facultative Aerobe
Answer: (b) Facultative Anaerobe
Explanation: Mycoplasmas can grow with or without oxygen, making them facultative anaerobes.