MDCAT Biology Kingdom Prokaryotes Test Online Mcqs

MDCAT Biology Prokaryotes Test

This free online MCQ test on Kingdom Prokaryotes is designed specifically for MDCAT Biology preparation. It covers key concepts including the structure, classification, reproduction, and characteristics of prokaryotic organisms, especially bacteria and archaea. Ideal for students preparing for MDCAT, NUMS, and other medical entrance exams, this quiz helps reinforce your understanding of important biological principles related to unicellular organisms. Practice now to boost your accuracy and confidence.

MDCAT Prokaryotes Online Test Mcqs

MDCAT 2025 Prokaryotes Question with Answer Mcqs

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1. Which bacteria convert milk into yogurt?

E. coli

Lactobacillus

Vibrio

Salmonella

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2. Which of these structures allows bacteria to exchange genetic material?

Flagella

Pili

Ribosomes

Capsule

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3. What is the shape of Streptococcus bacteria?

Spiral

Spherical in chains

Comma-shaped

Rod

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4. Which of the following best describes the DNA in prokaryotic cells?

Found in mitochondria

Circular and free in cytoplasm

Present inside lysosomes

Linear and enclosed in a nucleus

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5. Which bacteria is used in nitrogen fixation in legumes?

Salmonella

Vibrio cholerae

E. coli

Rhizobium

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6. Which of the following is a harmful effect of bacteria?

Tooth decay

Yogurt production

Nitrogen fixation

Vitamin K synthesis

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7. What is the purpose of Gram staining in bacteria?

To determine oxygen requirement

To identify plasmids

To differentiate cell wall structure

To measure bacterial size

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8. Which type of bacteria requires oxygen to survive?

Facultative anaerobes

Obligate aerobes

Obligate anaerobes

Aerotolerant anaerobes

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9. Which of the following terms refers to bacteria that can survive without oxygen?

Anaerobic

Aerobic

Facultative aerobes

Obligate aerobes

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10. What is the function of the bacterial flagellum?

Movement

Energy production

DNA replication

Protein synthesis

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11. Which structure helps in bacterial conjugation?

Ribosomes

Capsule

Flagella

Pili

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12. Which of the following is a sexually transmitted bacterial disease?

Dengue

Hepatitis B

AIDS

Syphilis

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13. Which structure helps bacteria attach to surfaces?

Flagella

Ribosomes

Nucleoid

Pili

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14. What is the term for spherical-shaped bacteria?

Coccus

Spirillum

Vibrio

Bacillus

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15. The main difference between prokaryotes and eukaryotes is:

Presence of cytoplasm

Presence of nucleus

Presence of cell wall

Ability to reproduce

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16. Which bacterial structure can survive extreme conditions?

Pili

Flagellum

Capsule

Endospore

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17. Which structure protects bacteria from harsh conditions?

Capsule

Ribosome

Cell wall

Cytoplasm

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18. Which of the following components is absent in bacterial cells?

Cytoplasm

Ribosomes

Nucleus

Cell wall

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19. How do bacteria reproduce?

Budding

Binary fission

Meiosis

Mitosis

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20. Which of the following processes allows bacteria to resist unfavorable conditions?

Budding

Conjugation

Binary fission

Sporulation

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21. Which method is used to grow bacteria in laboratories?

Culture in nutrient agar

PCR

Microscopy

DNA sequencing

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22. What is a plasmid?

A small circular DNA molecule

A membrane

A protein factory

A bacterial chromosome

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23. Which method is used to sterilize surgical tools to kill bacteria?

Boiling

Pasteurization

Freezing

Autoclaving

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24. Which of the following diseases is caused by bacteria?

Tuberculosis

Influenza

AIDS

Malaria

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25. What is the primary role of ribosomes in bacterial cells?

Protein synthesis

ATP production

Waste removal

DNA storage

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26. Which of the following is a function of bacterial capsule?

Protection against phagocytosis

Protein synthesis

Photosynthesis

DNA replication

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27. Which of the following is used in the preparation of antibiotics?

Algae

Viruses

Bacteria only

Fungi and some bacteria

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28. What kind of cell wall is found in Gram-negative bacteria?

No peptidoglycan

Only cellulose

Thick peptidoglycan

Thin peptidoglycan with outer membrane

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29. Which of the following is NOT a shape of bacteria?

Bacillus

Coccus

Polygonal

Spirillum

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30. Which of the following is a photosynthetic prokaryote?

Amoeba

Protozoa

Fungi

Cyanobacteria

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31. Which of the following is a rod-shaped bacterium?

Coccus

Spirillum

Bacillus

Vibrio

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32. Which of the following bacterial infections affects the lungs?

Typhoid

Botulism

Tuberculosis

Cholera

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33. Which of the following is used to kill or inhibit bacteria?

Antibiotic

Hormones

Alcohol

Insulin

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34. Which part of a prokaryotic cell contains the genetic material?

Nucleoid

Nucleus

Capsule

Ribosome

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35. Which of the following structures is found in all prokaryotic cells?

Nucleus

Chloroplast

Cell wall

Mitochondria

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36. Which of the following is used to classify bacteria?

Their age

Their shape and Gram stain reaction

Their RNA sequence

Their ability to photosynthesize

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37. Which of the following bacteria is spiral-shaped?

Coccus

Lactobacillus

Spirillum

Bacillus

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38. Which of the following is true for Gram-positive bacteria?

Retain crystal violet stain

Have outer membrane

Are always pathogenic

Have thin peptidoglycan layer

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39. Which enzyme is produced by bacteria to resist antibiotics like penicillin?

Lipase

Protease

Catalase

Penicillinase (Beta-lactamase)

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40. Which cellular structure is responsible for protein synthesis in bacteria?

Nucleoid

Ribosomes

Pili

Capsule

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41. What is the typical size range of most bacteria?

100–1000 µm

10–100 mm

1–10 cm

1–10 µm

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42. Which bacteria is comma-shaped?

Coccus

Vibrio

Bacillus

Spirillum

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43. Bacteria reproduce by:

Mitosis

Meiosis

Binary fission

Budding

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44. Which of the following can survive boiling temperatures?

Protozoa

Endospores

Fungi

Gram-negative bacteria

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45. Which bacterial cell structure is targeted by penicillin?

Cell wall

Ribosomes

Capsule

Plasma membrane

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46. Which of these bacterial forms is involved in bioremediation?

E. coli

Pseudomonas

Bacillus subtilis

Staphylococcus

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47. Which of the following bacteria is beneficial to humans?

Lactobacillus

Vibrio cholerae

Salmonella

Mycobacterium tuberculosis

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48. Which type of bacteria converts nitrogen into a usable form for plants?

Vibrio

Lactobacillus

Nitrogen-fixing bacteria

Cyanobacteria

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