2018年5月11日 · Chlorophyta (green algae) Division of algae which are typically green in colour. In common with higher land plants, green algae include chlorophylls a and b among their principal pigments, have cellulose as the main constituent of cell walls, and form food reserves of starch. Consequently it is believed that the ancestors of land plants must ...

2018年6月27日 · Historically, cyanobacteria were classified with plants and called blue-green algae, although true algae are eukaryotic. Cyanobacteria appear early in the fossil record with some examples approximately 3.5 billion years old. Stromatolites are large, often fossilized colonies of cyanobacteria that build up layer upon layer.

2018年5月18日 · Algae in Plant Evolution Photosynthetic protists (commonly called algae) are a diverse group of organisms and are divided into several phyla. Many are unicellular, including most euglenoids (phylum Euglenophyta) and dinoflagellates (Dinophyta), and some diatoms (Bacillariophyta) and green algae (Chlorophyta).

2018年6月27日 · Cryptomonads themselves are the evolutionary result of endosymbiosis, and are chimeric species that evolved from ancestral red algae and a non-photosynthetic host that retained the red alga nucleus under the form of a bead-like nucleomorph chromosome. The highly condensed chromosome of this Pyrrophyta consists of three different bead-like ...

2018年5月29日 · Chloroplast — Green organelle in higher plants and algae in which photosynthesis occurs. Domain — One of the three primary divisions of all living systems: Archae, Bacteria, or Eukaryota. Enzyme — Biological molecule, usually a protein, which promotes a biochemical reaction but is not consumed by the reaction.

2018年5月29日 · The word amoeba comes from a Greek word meaning "to change." The amoeba moves by continually changing its body shape, forming extensions called pseudopods (false feet) into which its body then flows. The pseudopods also are used to surround and capture food — mainly bacteria, algae, and other protozoa — from the surrounding water. An ...

Bacteria, yeasts, fungi, and algae are capable of aerobic growth. The opposite of an aerobe is an anaerobe. An anaerobe does not require oxygen, or sometimes cannot even tolerate the presence of oxygen. There are various degrees of oxygen tolerance among aerobic microorganisms. Those that absolutely require oxygen are known as obligate aerobes.

2018年5月21日 · siphonaceous (siphoneous) Applied to algae in which the thallus is not divided up by septa, i.e. the many nuclei are not compartmentalized into cells. The typical siphónaceous alga has a large central vacuole surrounded by a layer of protoplasm , containing nuclei and chloroplasts , which lines the cell wall .

2018年5月23日 · Slime Molds. There are two major unrelated phyla of slime molds. The Myxomycota are the true (plasmoidal) slime molds, and the Dictyosteliomycota are the cellular slime molds.

2018年5月21日 · Bacteria Bacteria are very small organisms, usually consisting of one cell, that lack chlorophyll (a green pigment found in plants that allows for the production of food).