Protozoa — identify the attribute that protozoa are generally NOT characterized by
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AMulticellular organization
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BMicroscopic size range
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CAbsence of a rigid cell wall
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DEukaryotic cell structure
Answer
Correct Answer: Multicellular organization
Explanation
Introduction:By definition, protozoa are single-celled eukaryotes. This question tests recognition of their basic organizational level and key cellular features.
Given Data / Assumptions:
- We compare multicellularity versus unicellularity.
- Other traits: microscopic scale, no rigid cell wall, eukaryotic nature.
Concept / Approach:Protozoa are unicellular eukaryotes, typically lacking rigid cell walls (unlike fungi/algae). They are microscopic and possess membrane-bound organelles and nuclei, defining them as eukaryotic.
Step-by-Step Solution:
Check for multicellularity: not a protozoan trait ✘Confirm microscopic: true ✔Confirm lack of rigid wall: true ✔Confirm eukaryotic: true ✔Verification / Alternative check:Standard protozoology sources define protozoa as single-celled; colonies may exist, but each unit is an independent cell, not a true multicellular organism with tissues.
Why Other Options Are Wrong:
- Microscopic: matches typical size.
- No rigid wall: characteristic feature facilitating phagocytosis and motility.
- Eukaryotic: nucleus and organelles are present.
Common Pitfalls:Confusing colonial aggregations with multicellular tissue-grade organization.
Final Answer:Multicellular organization