词汇 | multicellular |
释义 | multicellular adjective biology specializeduk /ˌmʌl.tiˈsel.jə.lər/ us /ˌmʌl.tiˈsel.jə.lɚ/ A multicellular organism is made of many cells: 多细胞的 Some green algae are multicellular.一些绿藻是多细胞生物。 Compare unicellular Cells actin anaphase anti-platelet assort axoplasm histochemistry histography homologous chromosomes infiltration intercellular neoplasia nerve fibre neurofibril neurofibrillary neuroglia teratoma tetrad thrombocyte thymocyte turgor multicellular | American Dictionarymulticellular adjective[ not gradable ] us/ˌmʌl·tiˈsel·jə·lər, ˌmʌl·tɑɪ-/ biology made of many cells Examples of multicellularmulticellular In multicellular organisms different patterns have been reported. However, amazing adaptations to extreme stresses do not only occur in microbes, but also in many multicellular organisms. Movement was present in the cells that gave rise to multicellular organisms some 3,000 million years ago. Molecular permeability is difficult to assess even qualitatively in multicellular systems (such as pieces of tissue or sheets of cultured cells). The adaptive pathway that led from choanoflagellates to the multicellular sponges may have involved the organization of different cell types. As some of the multicellular extremophiles discussed here clearly underline, this does not necessarily have to be the case. In other words, the biological diversity of the microbes is much greater than that of large multicellular organisms. The mechanism responsible for the destruction of the secretory epithelium is apoptosis, a form of programmed cell death that occurs in all multicellular animals. This contrasts with most other multicellular plant systems, including the angiosperms, where fertilisation occurs deep within the maternal tissue. That issue is defining the spatially and temporally restricted processes that must occur for a fertilised oocyte to transform into a multicellular organism. In multicellular organisms, body size has two components : cell size and cell number. Like the tardigrades, the rotifers are multicellular animals. Once formed at a cold temperature, the multicellular structures were stable at room temperatures despite agitation of the culture for 1 day. Adaptations to environmental extremes by multicellular organisms tubes create more homogeneous chemical and thermal microniches and likely play a role in microbial diversity. The intense magenta color indicates intense positive staining in this multicellular aggregate. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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