A unicellular organism with a cell membrane and a nucleus that moves using a flagella is most likely classified as which of the following?

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BlackTom AI · Accepted Answer

Consider the description given: a unicellular organism that has a cell membrane and a nucleus and moves using a flagellum. This combination of features helps narrow down the classification.
Option 1: Protist. Many protists are unicellular eukaryotes with a nucleus (true membrane-bound) and can have flagella for locomotion. This matches the description well, so this option is a strong fit.
Option 2: Plant. Plants are multicellular and have cell walls made of cellulose, chloroplasts for photosynthesis, and typically do not rely on flagella for movement. The single-celled aspect and flagellated movement argue against a plant, making this option unlikely.
Option 3: Eubacteria. Eubacteria are prokaryotes—lacking a true nucleus and membrane-bound organelles—and they do not typically have a nucleus. They can have flagella for movement, but the absence of a nucleus contradicts the given description, so this option is incorrect.
Option 4: Fungi. Fungi are also mostly multicellular (except some yeasts, which are unicellular) and do not generally use flagella for movement in their typical forms; they have chitinous cell walls and a haploid/dikaryotic lifecycle. The presence of a defined nucleus is true, but the unicellular plus flagellated movement pattern does not align well with fungi overall, making this a poor fit.
In summary, the combination of being unicellular, possessing a nucleus, and moving by a flagellum most closely aligns with protists, while the other options either imply multicellularity, absence of a nucleus, or characteristics not consistent with the given description.

SCI-BIO B Ecology Module Exam

A unicellular organism with a cell membrane and a nucleus that moves using a flagella is most likely classified as which of the following?

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