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  2. Algae - Wikipedia

    en.wikipedia.org/wiki/Algae

    The chloroplasts of red algae have chlorophylls a and c (often), and phycobilins, while those of green algae have chloroplasts with chlorophyll a and b without phycobilins. Land plants are pigmented similarly to green algae and probably developed from them, thus the Chlorophyta is a sister taxon to the plants; sometimes the Chlorophyta, the ...

  3. Mitochondrial DNA - Wikipedia

    en.wikipedia.org/wiki/Mitochondrial_DNA

    Mitochondrial DNA is a small portion of the DNA contained in a eukaryotic cell; most of the DNA is in the cell nucleus, and, in plants and algae, the DNA also is found in plastids, such as chloroplasts. [3] Human mitochondrial DNA was the first significant part of the human genome to be sequenced. [4]

  4. Protist - Wikipedia

    en.wikipedia.org/wiki/Protist

    A third lineage of algae, the glaucophytes (25 species), [46] contains rare and obscure species found in surfaces of freshwater and terrestrial habitats. [89] The red algae or Rhodophyta (>7,100 species) are a group of diverse morphologies, ranging from single cells to multicellular filaments to giant pseudoparenchymatous thalli, all

  5. Marine protists - Wikipedia

    en.wikipedia.org/wiki/Marine_protists

    Green, red and brown algae all have multicellular macroscopic forms that make up the familiar seaweeds. Green algae , an informal group, contains about 8,000 recognised species. [ 49 ] Many species live most of their lives as single cells or are filamentous, while others form colonies made up from long chains of cells, or are highly ...

  6. Unicellular organism - Wikipedia

    en.wikipedia.org/wiki/Unicellular_organism

    Diatoms, unicellular algae that have siliceous cell walls. [46] They are the most abundant form of algae in the ocean, although they can be found in fresh water as well. [46] They account for about 40% of the world's primary marine production, and produce about 25% of the world's oxygen. [47] Diatoms are very diverse, and comprise about 100,000 ...

  7. Microorganism - Wikipedia

    en.wikipedia.org/wiki/Microorganism

    The nucleus is an organelle that houses the DNA that makes up a cell's genome. DNA (Deoxyribonucleic acid) itself is arranged in complex chromosomes. [58] Mitochondria are organelles vital in metabolism as they are the site of the citric acid cycle and oxidative phosphorylation. They evolved from symbiotic bacteria and retain a remnant genome. [59]

  8. Human skin - Wikipedia

    en.wikipedia.org/wiki/Human_skin

    The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue guarding muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals' skin, and it is very similar to pig skin.

  9. Plastid - Wikipedia

    en.wikipedia.org/wiki/Plastid

    Chloroplasts: found in green algae (plants) and other organisms that derived their genomes from green algae. Muroplasts : also known as cyanoplasts or cyanelles, the plastids of glaucophyte algae are similar to plant chloroplasts, excepting they have a peptidoglycan cell wall that is similar to that of bacteria .