| | | D) | All living organisms are composed of one or more cells. | | | | | | Feedback: Cell theory states: all living things are made of cells; cells basic units of structure and organization; cells arise only from previously existing cells. Most prokaryotic cells do not have specialized internal structures. | | 2 CORRECT | | A ____ contains polar and nonpolar ends, forming the plasma membrane. | | | A) | microtubule | | | B) | transport protein | |
Bacteria reproduces by most commonly occurs by a kind of cell division called binary fission. Binary fission results in the formation of two bacterial cells that are genetically identical. 6. The Archaea these microbes are prokaryotes, meaning that they have no cell nucleus or any other membrane-bound organelles within their cells. 7.
All viruses have genes made from either DNA or RNA, long molecules that carry genetic information; all have a protein coat that protects these genes; and some have an envelope of fat that surrounds them when they are outside a cell. Fungi are diverse in terms of their shape, size & means of infecting humans. Fungi are eukaryotes, meaning that like parasites, their cells have a true nucleus and complex internal structures. They are most commonly found as environmentally resistant spores and molds, but can cause disease in humans in the forms of yeasts. Parasites are part of a large group of organisms called eukaryotes.
They are rough and smooth bodies that are in the cytoplasm. There are many differences and similarities between a plant and animal cell. The cells of animals and plants have three basic structures. They both contain a cell membrane which holds all the fluids. The cells also have a nucleus called the control center.
Viruses are infectious agents, often highly host-specific, consisting of genetic material surrounded by a protein coat. Viruses are not alive, they cannot grow or multiply on their own and need to enter cell and take over the cell to help them multiply. Fungi – these are members of a large group of eukaryotic organisms that includes microorganisms such as yeast and molds, as well as the more familiar mushrooms. Fungi can be single-celled, multinucleated, or multicellular organisms. Although they are eukaryotes like plants and animals, the major difference is that fungal cells have cell walls that contain chitin, unlike the cell walls of plants, which contain cellulose.
However, a unique structure that plant cells have is cell wall, large central vacuole and chloroplasts which are absent in animal cells. And the structure only unique to the animal cell is centrioles. ( Jones et al, 2014 ) We can now use different methods to study the cell. But the most common way to study the cell used by scientists are microscopes. The structure and organelles of the cell can be observed under a microscope.
The third domain, Domain Eukarya, contains the four kingdoms, Protista, Plantae, Fungi, and Animalia, all of which are eukaryotes. All kingdoms in domain eukaryote are multicellular, contain a nucleus, where their DNA (deoxyribonucleic acid) is stored, and they have a complex cell structure, complete with organelles. Protists are mostly single celled organisms that include algae,
| | Cells | Cells are the smallest functional unit organism. Cells have many different functions inside of living things. | | Eukaryotic | An Eukaryotic cell is a cell that has a nucleus and all of the organelles in the inside are protected by a cell membrane. | | Prokaryotic | Prokaryotic cells don't have a nucleus. | | Cell Membrane | The Cell Membrane holds everything inside the cell together and protects it from things that could harm it.
Giardia lacks many of the prominent organelles, such as peroxisomes and mitochondria that are characterisitic of eukaryotic organisms. Although they do lack these organelles, they have many of the endomembrane protein transport systems of higher cells. [ (Boltz) ] The life cycle of Giardia consists of a reproductive, trophozoite form that inhabits the intestinal lining of its host, and a cyst form that can exist outside of its host for periods of time. The structures of these cells are quite different to ensure their survival in their exceptionally changeable environments. Giardia exists in active (trophozoite) and dormant (cyst) stages.