what are differences and likelinesses of single celled and multicelled organisms?
494099
same:   both have a lipid bi-layer membrane.  Both have Peripheral and integral membrane proteins.\n\nDifference:  single celled normally have cilia or flagella, single celled macrophage whereas multicelled normally don't.  Multicelled handle disease better.
814648
Taking a stab at it...I think it's C.  \n\nFrom what I can remember, during the life cycle of a slime mold, it begins as a large unicellular organism that eventually aggregates with surrounding cells to produce smaller individual organisms that are a part of a larger multicellular organism.
961394
...to live and reproduce? You need to be more specific... what kind of animal cell? In what organ? Or is it a single-celled organism? Do you mean the structure?
1135493
Biology has become such a vast research enterprise that it is not generally regarded as a single discipline, but as a number of clustered sub-disciplines. This article considers four broad groupings. The first group consists of those disciplines that study the basic structures of living systems: cells, genes etc.; the second group considers the operation of these structures at the level of tissues, organs, and bodies; the third group considers organisms and their histories; the final constellation of disciplines focuses on their interactions. It is important to note, however, that these boundaries, groupings, and descriptions are a simplified characterization of biological research. In reality, the boundaries between disciplines are fluid, and most disciplines frequently borrow techniques from each other. For example, evolutionary biology leans heavily on techniques from molecular biology to determine DNA sequences, which assist in understanding the genetic variation of a population; and physiology borrows extensively from cell biology in describing the function of organ systems.
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Prokaryotes (from Old Greek pro- before + karyon nut or kernel, referring to the cell nucleus, + suffix -otos, pl. -otes; also spelled "procaryotes") are organisms without a cell nucleus (= karyon), or indeed any other membrane-bound organelles, in most cases unicellular (in rare cases, multicellular). This set of characteristics is distinct from eukaryotes (also spelled "eucaryotes"), organisms that have cell nuclei and may be variously unicellular or multicellular. The difference between the structure of prokaryotes and eukaryotes is so great that it is considered to be the most important distinction among groups of organisms. Most prokaryotes are bacteria, and the two terms are often treated as synonyms. However, Woese has proposed dividing prokaryotes into the Bacteria and Archaea (originally Eubacteria and Archaebacteria) because of the significant genetic differences between the two. This arrangement of Eukaryota, Bacteria, and Archaea is called the three-domain system. This replaces the two-empire system.\n\nhttp://en.wikipedia.org/wiki/Prokaryote\n\n\nA eukaryote (IPA: [juːˌkarɪəʊt]), also spelled eucaryote, is an organism with a complex cell or cells, in which the genetic material is organized into membrane-bound nucleus/nuclei. Eukaryotes comprise animals, plants, and fungi—which are mostly multicellular—as well as various other groups that are collectively classified as protists (many of which are unicellular). In contrast, prokaryotes are organisms, such as bacteria, that lack nuclei and other complex cell structures. Eukaryotes share a common origin, and are often treated formally as a superkingdom, empire, or domain. The name comes from the Greek ευ, meaning good, and κάρυον, meaning nut, in reference to the cell nucleus).\n\nhttp://en.wikipedia.org/wiki/Eukaryote\n\nMORE STUFF ON LINKS
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These differences are down to cellular level:\n\nEUKARYOTES:\n--Relatively bigger compared to prokaryotes \n--Have true nucleus (surrounded by nuclear envelope)\n--Cells contain golgi, lysosomes, ribosomes and endoplasmic reticulum\n--Have cell wall made of cellulose and chitin\n--Have linear DNA with protein forming true chromosomes\n--Have a nucleolus\n--Their flagella consist of microtubules\n--Membrane-bounded organelles like chloroplast present\n\nPROKARYOTES:\n--Relatively smaller in size\n--Don't have a permanent nucleus\n--Their cells contain ribosomes, but no vacuole or golgi\n--Cell wall is rigid and made up of murein\n--Have circular DNA, with no true chromosomes\n--No nucleolus present\n--Their flagella lack microtubules\n--No membrane bounded organelles present
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Bacteria are prokaryotic organisms. They are mostly unicellular, and they have no nucleus and other cell structures.\n\nProtists and Fungi, on the other hand, are eukaryotes, which are unicellular or multicellular organisms that have a nucleus and complex structures like mitochondria and chloroplasts.\n\nfor more details, go to an encyclopedia website like http://www.wikipedia.org
607530
Uhhh.... isn't bacteria a single-cell organism?\nPlease be more specific.
137015
eukarotic bacteria are unicellular; fungi can be multicellular whereas bacteria can not. Bacteria move themselves by means of a flagella unlike fungi which don't. Bacteria lack a nucleous and mitochondria unlike fungi. Many bacteria have differing cell walls from fungi. I believe the term used is peptidoglcoans, which describes the cell wall.
1072914
smallest to largest in a multicellular organism.\ncell-tissue-organ-organ system-organism
874357
Starting with the fact that all are single cell layers. They all have a nucleus, cell membrane, ribosomes, mitochondria,
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1)  The cell is the unit of structure, physiology, and organization in living things. \n   2)  The cell retains a dual existence as a distinct entity and a building block in the   construction of organisms. \n   3)  Cells form by free-cell formation, similar to the formation of crystals (spontaneous generation).\n\nKeep this as hint and do your homework
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The six characteristics of living things, and an explanation of each one. \nTheme #1 - Cells \n\nAll living things are composed of one or more cells. Different types of cells have different "jobs" within the organism. Each life form begins from one cell, which then will split. These cells split, and so on. After this has happened several times, differentiation is undergone, when the cells change so that they are not the same thing anymore. Then they are used to begin to put together the final organism, some cells, for example, as the eyes, some as the heart, etc. The only arguable exception to this is viruses. They are not composed of cells, but are said to be "living." \nTheme#2 - Organization \n\n \nComplex organization patterns are found in all living organisms. They arrange themselves on very small levels, grouping like things together. On larger levels, they become visible. This also has to do with differentiation, as the cells are organized in a manner that makes sense for the organism after they change to what they’ll be in the final organism. \n\nTheme#3 - Energy Use \n\nAll organisms use energy. The sum of the chemical energy they use is called metabolism. This energy is used to carry out everything they do. Autotrophs (plants) use energy from the sun for photosynthesis, to make their own ‘food’ (glucose). Heterotrophs (animals and humans) must ingest food for this purpose. \n\n\nTheme#4 - Homeostasis \n\nAll organisms have stable internal conditions which must be maintained in order to remain alive. These include temperature, water content, heartbeat, and other such things. In a way, this has to do with energy use, because a certain level of energy must be kept within the body at all times. For this, obviously, humans must then ingest food on a regular basis. Not all conditions are for the body to maintain itself; though most are. \n\n\nTheme#5 - Growth \n\nAll organisms grow and change. Cells divide to form new, identical cells. Differentiation happens, as well, when cells mutate into other types of cells, making a more complex organism. Organisms growing, changing, and becoming more complex is called development. Single-celled organisms do grow as well, but they will only become slightly larger – this is nearly unmeasurable. \n\n\nTheme#6 - Reproduction \n\nAll organisms reproduce in order to continue the species' life. This is combining genetic information (in sexual reproduction) or splitting into two organisms (in asexual reproduction) in order to create another of the same species. In sexual reproduction, the new organism will have some characteristics from the mother, and some from father. It may look like either of them, or it may not. In asexual reproduction, the new organism is an exact copy of the first. Sometimes, not every member of a species is able to reproduce. As long as others are (which we know they can, if they still exist today) then it does not threaten the species. (Except for mules, but don't worry about them, they are a bizarre anomoly.)
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Cell bio would encompass all things on a cellular level.\nUsually organisms with a "life of their own".\nMolecular bio goes further into the atomic level.\nEg: a molecule of water (H2O) consists of 3 atoms. take a H away and you have Hydrogen peroxide(HO). A cell is usually made up of many different molecules when added together, make an organism like a liver cell, cancer cell, stem cell,etc...
420599
Human cells and animal cells are very similar. Actually, human cells are types of animal cells. Every different tissue in your body is made up of different kinds of cells. They may have different structures, especially in their cell membrane, which make the function of that cell different. Therefore they do have similar functions, depending on their structure and characters.
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The cell is the structural and functional unit of all living organisms, and is sometimes called the "building block of life." Some organisms, such as bacteria, are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, (humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 µm, a typical cell mass 1 nanogram).\n\nThe cell theory, first developed in 1839 by Schleiden and Schwann, states that all organisms are composed of one or more cells; all cells come from preexisting cells; all vital functions of an organism occur within cells, and cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.
176550
one, they are what is known as unicellular (having 1 cell).