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Questions and Answers
What type of cellular structure do they have?
What type of cellular structure do they have?
- Unicellular with prokaryotic cells
- Multicellular with eukaryotic cells
- Multicellular with prokaryotic cells
- Unicellular with eukaryotic cells (correct)
What mostly performs metabolic functions in these cells?
What mostly performs metabolic functions in these cells?
- The cell membrane
- The cell wall
- Specialized internal structures (correct)
- External structures like flagella
What is found in the vesicular nucleus?
What is found in the vesicular nucleus?
- RNA only
- Central body called endosome or nucleoli (correct)
- Only nucleoli without endosome
- Chromatin exclusively
Which of the following lack DNA in their endosome?
Which of the following lack DNA in their endosome?
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What type of nuclei do ciliates have?
What type of nuclei do ciliates have?
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What does the plasma membrane enclose?
What does the plasma membrane enclose?
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What causes the nucleus to have a diffused appearance?
What causes the nucleus to have a diffused appearance?
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Study Notes
What is Protozoa?
- Protozoa are unicellular, eukaryotic, and heterotrophic organisms.
- They can be either free-living or parasites.
- There are approximately 65,000 species of protozoa, categorized into different groups.
Characteristics of Protozoa
- Lack a cell wall.
- Have various cell organelles that perform different tasks, similar to organs in higher animals.
Cellular Structure
- Protozoa are unicellular organisms with a eukaryotic cell.
- Metabolic functions are performed by specialized internal structures.
- Typically have one membrane-bound nucleus in the cell.
- The nucleus has a diffused appearance due to scattered chromatin.
- The vesicular nucleus contains a central body called endosome or nucleoli.
- Nucleoli of apicomplexans have DNA, whereas amoeboid nucleoli lack DNA.
- Ciliates have micronucleus and macronucleus.
- The plasma membrane encloses the cytoplasm and locomotory projections like flagella, pseudopodia, and cilia.
Protozoa and Diseases
- Some protozoa cause diseases in animals and humans, such as:
- Plasmodium (malaria)
- Trypanosoma (sleeping sickness)
- Trichomonas (trichomoniasis)
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