Q:

What is the difference between a protozoa and a bacteria?

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Quick Answer

Bacteria and protozoa are very distantly related, with bacteria classified as prokaryotes and protists as eukaryotes. This means that protozoa are more closely related to humans than either is to bacteria. The two organisms are structurally distinct. Bacterial cells lack a nucleus, and protozoa contain organelles, such as mitochondria.

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What is the difference between a protozoa and a bacteria?
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Bacteria are generally smaller than protozoa, which frequently feed on bacteria. All protozoa "eat" by enveloping their prey within small pockets called vacuoles, while bacteria can absorb nutrients through their cell walls. Bacteria almost always reproduce via simple binary fission. While some protozoa also use this method, some split into more than two offspring, and some reproduce sexually.

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Related Questions

  • Q:

    What are examples of protozoa?

    A:

    Cryptosporidium, Toxoplasma gondii, Pneumocystis carinii, Acanthamoeba, Giardia lamblia and Naegleria are all examples of protozoa. They are unicellular eukaryotic organisms that exist in all habitable environments on Earth, and many species of protozoa act as parasites on higher animals.

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  • Q:

    How do protozoa move?

    A:

    Protozoa move by cell extension, flagella and cilia; the method of movement is determined by the type of organism and the surrounding environment. Protozoa are classified into three groups: ciliates, amoebae and flagellates. Ciliates move using tiny cilia, flagellates move through water using flagella as oars and paddles and amoeba crawl along surfaces by extending parts of their cells.

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  • Q:

    What are the most common prokaryotes?

    A:

    The two domains of prokaryotes, which are archae and bacteria, contain the common organisms of cyanobacteria, halophiles and hyperthermophiles. Prokaryotes occur in many forms, and some species are more common than others. Of the two prokaryotic domains, the bacteria domain is the most populous and diverse.

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  • Q:

    Do prokaryotes have mitochondria?

    A:

    Prokaryotes do not have mitochondria. A prokaryote is a cell that does not contain membrane-bound structures called organelles. A mitochondrion is an organelle, but because prokaryotes do not have organelles, they do not have mitochondria.

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