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Kingdom Prokaryotae MCQs for MDCAT Practice

Biology section, Kingdom Prokaryotae chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 715 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    When coccus divides in three planes, it will produce a:
    • Sarcina (correct answer)
    • Tetrad
    • Streptococcus
    • Staphylococcus
    Correct answer: A
    Understand bacterial cell division patterns: cocci dividing in three planes form sarcinae, a characteristic cubical arrangement.
  2. Question 2
    Division of cucci in three planes results in formation of:
    • Sarcina (correct answer)
    • Tetrad
    • Streptococci
    • All of the above
    Correct answer: A
    Bacterial cell division planes dictate colony morphology. Division in three perpendicular planes yields sarcina.
  3. Question 3
    Bacteria which obtain their food from dead organic matter called as
    • heterotrophs
    • autotrophs
    • saprophytic (correct answer)
    • symbiotic
    Correct answer: C
    Bacteria feeding on dead organic matter are specifically termed saprophytic, distinguishing them from other nutritional modes like heterotrophic or autotrophic.
  4. Question 4
    If we say that antibiotics kill the bacteria when it is in the rapidly dividing and growing phase, then when will an antibiotic penicillin kill the bacteria?
    • Stationary phase
    • Lag phase
    • Log phase (correct answer)
    • Death phase
    Correct answer: C
    Penicillin targets actively growing bacteria, making the log phase the most vulnerable period for antibiotic action.
  5. Question 5
    All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia
    • Can induce root nodules on many plant species
    • Can fix nitrogen in the freeliving state (correct answer)
    • Cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids
    • Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex
    Correct answer: B
    Frankia, a nitrogen-fixing bacterium, forms symbiotic nodules with plants but cannot fix nitrogen independently in the free-living state.
  6. Question 6
    Auxospores and hormogonia are formed, respectively, by
    • Some diatoms and several cyanobacteria
    • Some cyanobacteria and many diatoms
    • Everal cyanobacteria and several diatoms
    • Several diatoms and a few cyanobacteria (correct answer)
    Correct answer: D
    Diatoms form auxospores for growth, while cyanobacteria produce hormogonia for vegetative reproduction and fragmentation. (Prokaryotae/Protista)
  7. Question 7
    Which of the following is aerobic bacterium?
    • Spirochete
    • E. coli
    • Cyanobacteria
    • Pseudomonas (correct answer)
    Correct answer: D
    Identify aerobic bacteria from given options. Pseudomonas is a well-known obligate aerobe, distinct from facultative anaerobes or obligate anaerobes.
  8. Question 8
    The physical method used to control Bacteria is
    • Antiseptics
    • Disinfectants
    • Pasteurization (correct answer)
    • Antibiotics
    Correct answer: C
    Distinguishes between physical and chemical methods of bacterial control, highlighting heat treatment as a physical approach.

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