RE: What is an example of a multicellular protist and to represent it

These types of protists are also equipped with the plant like ability to perform photosynthesis.
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kelp is a multicellular protist and can be over 100-meters ..

Within the eukaryotic domain, the protists are no longer a single group. They have been redistributed amongst different branches of the family tree. According to Simpson, we now know most of the evolutionary relationships amongst protists, and these are often counterintuitive. He cited the example of dinoflagellate algae, which are more closely related to the malaria parasite than they are to diatoms (another group of algae) or even to land plants.

The malaria-causing protist,  is a prominent example of pathogenic protists.
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Protists that are multicellular do nothave ..

The first instinct of scientists was to relate these organisms to plants and animals by relying on morphological characteristics. The term protozoan (plural: protozoa or protozoans), meaning "early animals," was introduced in 1820 by naturalist Georg A. Goldfuss, according to a published in the journal International Microbiology. This term was used to describe a collection of organisms including ciliates and corals. By 1845, Protozoa was established as a phylum or subset of the animal kingdom by German scientist Carl Theodor von Seibold. This phylum included certain ciliates and amoebas, which were described by von Seibold as single-celled animals. In 1860, the concept of protozoans was further refined and they were elevated to the level of a taxonomic kingdom by paleontologist Richard Owen. The members of this Kingdom Protozoa, in Owen's view, had characteristics common to both plants and animals.

We do notknow how the various groups of protists are related to one another.
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All living organisms can be broadly divided into two groups — prokaryotes and eukaryotes — which are distinguished by the relative complexity of their cells. In contrast to prokaryotic cells, eukaryotic cells are highly organized. Bacteria and archaea are prokaryotes, while all other living organisms — protists, plants, animals and fungi — are eukaryotes.

Even the multicellular protists have a very elementary structure insomuch as they lack specialized tissues.
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Give two examples of a fungal-like protist

The ability for eukaryotes to carry out photosynthesis was made possible by one or more symbiotic associations between heterotrophic eukaryotes and photosynthetic prokaryotes (or their descendents). There were several primary symbioses between eukaryotes and blue green algae. In one lineage, the photosynthetic organism lost much of its genetic independence and became functionally and genetically integrated as chloroplasts within the host cell. Modern chloroplasts, also called plastids, are bounded by two or more membranes, and most usually lie free in the cytoplasm, but in some cases they may be located within a fold of the nuclear envelope, or may be associated with the cytoplasm and residual nucleus of a eukaryotic endosybiont. The descendents of some of these primary plastids have gone on to form further associations. At least two types of protists (chloroarachniophytes and cryptomonads) have acquired 'plastids' by forming symbioses with eukaryotic algae. This are referred to as secondary symbioses.

Protist | Multicellular organism | Mediander | Topics

At one time, simple organisms such as amoebas and single-celled algae were classified together in a single taxonomic category: the kingdom Protista. However, the emergence of better genetic information has since led to a clearer understanding of evolutionary relationships among different groups of protists, and this classification system was rendered defunct. Understanding protists and their evolutionary history continues to be a matter of scientific discovery and discussion.

Protists range from single-celled amoebas to multicellular seaweed

Plant-like protists make their own food, and many have cell walls made of cellulose. Animal-like protists cannot make their own food and ingest it. Some animal-like protests have “shells,” called tests, which are made of silica or calcium carbonate. Other animal-like protists lack a cell wall or protective test. The fungi-like protists are actually not evolutionarily related to fungi, although they do take in food by absorption. Like plants, however, their cell walls are made of cellulose.

algal & fungal protist notes b1 - Biology Junction

Since we will observe how protists move, it will be interesting to figure out patterns of locomotion. For example, what happens when the protist encounters an obstacle? Does motion change when the organism is feeding? How does motion relate to where the organism lives? What characteristics do the protists exhibit: plant, animal, or both? Do the plant/animal characteristics influence motion patterns?