Question:

Choose the correct statements among the following

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No virus ever contains both DNA and RNA simultaneously.
This is a high-yield rule of thumb in microbiology that helps quickly eliminate incorrect options.
Updated On: Jul 22, 2026
  • Kingdom Protista include Euglena, Plasmodium and Amoeba
  • Cyanobacteria has the advanced characters of photosynthesis
  • Bacteriophage contain both DNA and RNA as genetic material
  • In fungi the cell wall is made up of chitin and glycogen
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The Correct Option is A

Solution and Explanation

Step 1: Understanding the Question:
The question requires us to evaluate four statements regarding biological classification and identify the correct one.
The statements cover Kingdom Protista, Cyanobacteria, Viruses, and Kingdom Fungi.

Step 2: Key Concepts and Approach:
We systematically analyze each statement based on Whittaker's Five Kingdom Classification system and general microbiology concepts.

Step 3: Detailed Explanation:

Statement A: Kingdom Protista contains all unicellular eukaryotic organisms.
This includes Euglena (a euglenoid), Plasmodium (a protozoan sporozoan), and Amoeba (an amoeboid protozoan).
Hence, this statement is correct.

Statement B: Cyanobacteria (blue-green algae) are photosynthetic prokaryotes.
While they perform oxygenic photosynthesis, they contain primitive prokaryotic cellular machinery, not "advanced characters of photosynthesis" which are characteristic of eukaryotic plants.

Statement C: Viruses contain either DNA or RNA as their genetic material, never both.
Bacteriophages are viruses that infect bacteria and typically contain double-stranded DNA.

Statement D: The cell wall of fungi is composed of chitin and beta-glucans.
Glycogen is the reserve food material stored inside fungal cells, not a structural component of their cell walls.


Step 4: Final Answer:
Statement A is correct as Kingdom Protista comprises unicellular eukaryotes such as Euglena, Plasmodium, and Amoeba.
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