Free Kingdom Prokaryotae MCQs with Answers

• A. Mode of nutrition
• B. Mode of respiration
• C. Pigment composition
• D. Cell wall composition

Explanation: The correct answer is D) Cell wall composition, as bacteria and cyanobacteria both have cell walls containing peptidoglycan, making them…

• A. Grow and multiply in very deep marine sediments
• B. Occur in water containing high concentrations of barium hydroxide
• C. Readily grow and divide in sea water enriched in any soluble salt of barium
• D. Grow slowly in highly alkaline frozen lakes at high altitudes

Explanation: All options are explained below:a)Basophilic prokaryotes are known for their ability to grow and multiply in very deep marine…

• A. Bacteria
• B. Actinomycetes
• C. Fungi
• D. Laboratory

Explanation: Answer is "Laboratory"Explanation: Synthetic antibiotics.

• A. Actinomycetes
• B. Fungi
• C. Bacteria
• D. Actinomycetes, Bacteria and Fungi

Explanation: Answer is "Actinomycetes, bacteria and fungi"Explanation: Biological antibiotics are produced by certain fungi actinomycetes and bacteria…

• A. Oscillatoria
• B. Rhodospirillum
• C. Chlorobium
• D. Chromatium

Explanation: In summary, oxygenic photosynthesis occurs in organisms like cyanobacteria (e.g., Oscillatoria), which produce oxygen as a byproduct…

• A. Azotobacter
• B. Frankia
• C. Azolla
• D. Glomus

Explanation: Azotobacter: Azotobacter is a free-living nitrogen-fixing bacterium. It forms a symbiotic relationship with some plants, especially in the…

• A. Alternaria
• B. Erwinia
• C. Xanthomonas
• D. Pseudomonas

Explanation: Bacterial leaf blight of rice is primarily caused by a species of Xanthomonas. Here's an explanation of each of the options:1.

• A. Archaea completely differ from both prokaryotes and eukaryotes.
• B. Archaea completely differ from prokaryotes.
• C. All of these statements are correct.
• D. Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Explanation: Archaea are a unique group of prokaryotes that share some similarities with eukaryotes, yet they also have distinct features that set them…

• A. (ii) and (iii)
• B. (i), (ii) and (iii)
• C. (ii), (iii) and (iv)
• D. (i), (ii) and (iv)

Explanation: The correct statements are (i), (ii), and (iv). Methanogens are indeed archaebacteria that produce methane, particularly in anaerobic…

• A. Nucleoid
• B. Ribosomes
• C. Cell wall
• D. Mesosomes

Explanation: Mesosomes are specialized structures in bacteria that function similarly to mitochondria in eukaryotic cells.

• A. Mesosomes
• B. Holdfast
• C. Rhizoids
• D. Fimbriae

Explanation: Fimbriae are indeed small, bristle-like structures that extend from the surface of bacterial cells and are crucial for adhesion to various…

• A. Ectoparasite
• B. Obligate parasite
• C. Facultative parasite
• D. Endoparasite

Explanation: [A] Ectoparasite;parasite that lives outside of its host[B] obligate parasite is the parasite that cannot complete its life cycle without…

• A. Stationary phase
• B. Senescent phase
• C. Lag phase
• D. Exponential phase

Explanation: Maximum growth rate occurs in the exponential or acceleration or log phase.

• A. positive chemotaxis.
• B. negative chemotaxis
• C. positive magnetotaxis
• D. negative magnetotaxis

Explanation: Positive chemotaxis means moving towards a chemical stimulus i.e. O2 and energy source. So option A is correct.

• A. not survive in the presence of oxygen.
• B. utilise low concentration of oxygen only.
• C. survive without oxygen, but uses oxygen if it is present.
• D. neither use oxygen for its growth nor can be harmed by it.

Explanation: A facultative anaerobe, such as Escherichia coli, can grow in both aerobic (with oxygen) and anaerobic (without oxygen) environments.

• A. They are killed by free oxygen
• B. They essentially need free oxygen
• C. They can live with or without free oxygen
• D. They obtain free oxygen from the host's body

Explanation: Obligate anaerobic bacteria are organisms that cannot survive in the presence of oxygen.

• A. I
• B. IV
• C. I and IV
• D. II and III

Explanation: Gram staining is a method used to differentiate bacterial species into two groups based on the chemical and physical properties of their…

• A. Thin peptidoglycan layer
• B. Thick peptidoglycan layer
• C. Outer membrane of lipoprotein
• D. Outer membrane of lipopolysaccharide

Explanation: Gram staining is a method used to classify bacteria into two major groups: Gram-positive and Gram-negative, based on the structure of…

• A. Conjugation
• B. Transduction
• C. Transformation
• D. Endospore formation

Explanation: Bacterial transformation is the process where bacteria take up foreign DNA from their environment and incorporate it into their own…

• A. Dry heat
• B. Radiation
• C. Fltration
• D. Moist heat

Explanation: The correct answer is radiation. Ionizing radiation, such as gamma rays or X-rays, is used in sterilization because it can penetrate cells…