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 bacterial cell structure is targeted by penicillin?

Plasma membrane

Capsule

Ribosomes

Cell wall

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2. Which bacteria is comma-shaped?

Bacillus

Spirillum

Coccus

Vibrio

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3. Which of the following is a photosynthetic prokaryote?

Amoeba

Cyanobacteria

Protozoa

Fungi

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

Bacillus

Coccus

Spirillum

Polygonal

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5. What is a plasmid?

A protein factory

A small circular DNA molecule

A bacterial chromosome

A membrane

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

Alcohol

Insulin

Hormones

Antibiotic

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7. Which type of bacteria requires oxygen to survive?

Obligate aerobes

Facultative anaerobes

Obligate anaerobes

Aerotolerant anaerobes

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

No peptidoglycan

Thin peptidoglycan with outer membrane

Only cellulose

Thick peptidoglycan

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

To differentiate cell wall structure

To measure bacterial size

To identify plasmids

To determine oxygen requirement

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

Typhoid

Cholera

Tuberculosis

Botulism

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

Boiling

Freezing

Autoclaving

Pasteurization

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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 of the following components is absent in bacterial cells?

Ribosomes

Cell wall

Cytoplasm

Nucleus

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

Microscopy

DNA sequencing

Culture in nutrient agar

PCR

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

E. coli

Bacillus subtilis

Staphylococcus

Pseudomonas

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

Protection against phagocytosis

DNA replication

Protein synthesis

Photosynthesis

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17. Which structure helps in bacterial conjugation?

Ribosomes

Flagella

Capsule

Pili

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18. Which bacteria convert milk into yogurt?

Lactobacillus

Salmonella

E. coli

Vibrio

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

Nucleoid

Pili

Ribosomes

Capsule

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

Circular and free in cytoplasm

Linear and enclosed in a nucleus

Present inside lysosomes

Found in mitochondria

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

Are always pathogenic

Retain crystal violet stain

Have outer membrane

Have thin peptidoglycan layer

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23. Which of the following can survive boiling temperatures?

Fungi

Gram-negative bacteria

Endospores

Protozoa

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24. Bacteria reproduce by:

Binary fission

Meiosis

Budding

Mitosis

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

Tooth decay

Nitrogen fixation

Yogurt production

Vitamin K synthesis

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

Protein synthesis

Waste removal

DNA storage

ATP production

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

Vibrio

Bacillus

Coccus

Spirillum

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

Spirillum

Coccus

Vibrio

Bacillus

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

Bacteria only

Algae

Viruses

Fungi and some bacteria

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30. Which bacterial structure can survive extreme conditions?

Endospore

Flagellum

Capsule

Pili

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31. How do bacteria reproduce?

Meiosis

Budding

Mitosis

Binary fission

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

Facultative aerobes

Aerobic

Obligate aerobes

Anaerobic

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

Flagella

Capsule

Ribosomes

Pili

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

Penicillinase (Beta-lactamase)

Lipase

Protease

Catalase

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

AIDS

Influenza

Malaria

Tuberculosis

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36. What is the function of the bacterial flagellum?

Energy production

Protein synthesis

Movement

DNA replication

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

Vibrio

Lactobacillus

Nitrogen-fixing bacteria

Cyanobacteria

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

Mitochondria

Chloroplast

Cell wall

Nucleus

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

Vibrio cholerae

Lactobacillus

Salmonella

Mycobacterium tuberculosis

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

Ribosome

Nucleoid

Nucleus

Capsule

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41. Which structure helps bacteria attach to surfaces?

Ribosomes

Nucleoid

Flagella

Pili

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42. The main difference between prokaryotes and eukaryotes is:

Ability to reproduce

Presence of cytoplasm

Presence of cell wall

Presence of nucleus

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

Conjugation

Binary fission

Budding

Sporulation

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

1–10 cm

100–1000 µm

10–100 mm

1–10 µm

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45. What is the shape of Streptococcus bacteria?

Spiral

Comma-shaped

Spherical in chains

Rod

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

E. coli

Salmonella

Rhizobium

Vibrio cholerae

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47. Which structure protects bacteria from harsh conditions?

Cytoplasm

Capsule

Cell wall

Ribosome

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

Spirillum

Lactobacillus

Bacillus

Coccus

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