Problem 55 - Objective Biology for NEET

Question

The protist which possess flagella is (a) Paramoecium (b) Plasmodium (c) Trypanosoma (d) Entamoeba

Step-by-Step Solution

Answer

The protozoan that possesses flagella is Trypanosoma.

Step 1: Understanding the options

Consider all the given options. Paramoecium, Plasmodium, Trypanosoma and Entamoeba are all protists. Protists are a diverse group of eukaryotic microorganisms.

Step 2: Identifying the protist with flagella

Among the given options, Trypanosoma is a genus of kinetoplastids which is a monophyletic group of unicellular parasitic flagellated protozoa.

Step 3: Confirming the Answer

Thus, the protist which possesses flagella among the given options is Trypanosoma.

Key Concepts

Trypanosoma

Trypanosoma is a significant genus of protists known particularly for its flagellated forms. The flagella are whip-like structures that these organisms use for locomotion, and they are a defining characteristic of Trypanosoma. A unique feature of these organisms is that they can cause serious diseases in humans and animals, such as African sleeping sickness in humans and nagana in cattle, which are transmitted by the tsetse fly.

These protists are considered parasitic, meaning they live and feed on the host while causing harm. Their life cycle typically includes a stage inside a host insect and another within a mammalian host. Understanding the role of Trypanosoma in causing diseases can underscore the importance of studying protists and developing treatments to combat the illnesses they cause.

Kinetoplastids

Definition and Characteristics

Kinetoplastids are a group of flagellated protists, which include the genus Trypanosoma. Kinetoplastids are characterized by the presence of a kinetoplast, which is a network of circular DNA inside a large mitochondrion. This distinctive feature is not only integral to their structure but also to their function, playing a role in the cell's energy production and responses to environmental changes.

Significance in Research and Medicine

These organisms are of particular interest in the medical and scientific communities due to their complex life cycles and the diseases they cause. Researchers study kinetoplastids to understand their biology and interactions with hosts to derive potential treatments for diseases. Their adaptability and resistance to drugs also make them a fascinating group for evolutionary studies.

Eukaryotic Microorganisms

Eukaryotic microorganisms encompass a broad category of life forms, which includes protists like Trypanosoma and other kinetoplastids. Protists are inherently diverse, with the flagellated subgroup being one of their distinctive members. Unlike bacteria and archaea, eukaryotic microorganisms possess complex cell structures with membrane-bound organelles and nuclei containing genetic material.

This complexity allows for advanced functions and interactions within their environments. Eukaryotic microorganisms can be free-living or parasitic, and they may reproduce sexually or asexually. They play diverse roles in ecosystems, such as being part of the food chain, or in the case of parasitic species, impacting the health of other organisms. The study of eukaryotic microorganisms is essential in fields like ecology, medicine, and biotechnology, with ongoing research unveiling the intricacies of their existence and potential benefits or hazards to other life forms.