Atypical bacteria shapes12/10/2023 ![]() The entire organism is sometimes just a single cell that has many nuclei, or it may be composed of multiple units, that might be called cells, except that they are generally larger than normal and have multiple nuclei. coenocytic composition - the organism is made of ‘atypical’ cells, atypical in that they have multiple nuclei, sometimes thousands of them.colonial composition ( ‘ simple multicellularity ’) - the organism is made of multiple cells but the cells are generally similar in size and shape with no obvious tissues and organs.multicellular organisms ( ‘ complex multicellularity ’) - the organism is made of multiple (usually many) cells but the cells are different shapes and have a specific organized arrangement that involves tissues and organs.unicellular organisms - the organism is a single uninucleate cell.Most would agree that all organisms are made of cells, but is it one cell or many? And are the cells all the same or do they differ? And are the cells ‘typical’ in their organization? Here are four composition types, two of which are very familiar, and two of which are less so: In this chapter ’composition’ refers to an organism’s cellular nature. What are organisms composed of, i.e., what are they constructed of? A later chapter will consider composition in chemical and molecular terms. Organism shape: spheres, flatten ed, cylinders.1 Add to the Star Wars bar scene? This organism changes composition, form and size throughout its life with the most noticeable form being a cylinder about 10 cm in height topped with a sphere. ![]() Moreover, they are also often dynamic, changing during the existence of an organism. Composition, size, and shape are interrelated and significant to other aspects of an organism’s biology. ![]() This makes attempting to characterize the form of larger taxonomic entities (class, order, phylum) challenging, if not impossible. Consequently, although form, size and composition are extremely important to an organism’s biology, they are remarkably poor indicators of phylogeny. These characteristics have been shaped by evolution, and evidence of convergence (unrelated groups converging on a common form) and divergence (related groups showing a variety of forms) abound. Organisms vary from each other in multiple ways but in this chapter, I will focus on three aspects, two of which, size and form, are very straightforward, but the third aspect, composition, is less familiar. Without going outside this planet one can come up with a much more diverse set of organisms, as I hope this chapter demonstrates. It was a remarkably unimaginative effort: all of the life-forms illustrated had a striking resemblance to humans, all about the same size and with the same basic components (e.g., head, legs, arms). In the famous Star Wars bar scene, an attempt was made to illustrate diverse organisms.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |