The Evolution Of Eukaryotic Cells - 1102 Words

After the unanticipated discovery of a separate mitochondrial genome, there have been new insights into its inheritance and mutation. There is enough evidence to bolster the fact that fusion between a-proteobacteria and archaebacteria is an integral event in evolution of eukaryotic cells. However, it has also been conjectured that eukaryotic cell may have originated from prokaryotes. As a part of this evolution, many mitochondrial ancestral genes were lost. These are the genes that were no longer required in their new host cell environment. All eukaryotes contain genes of mitochondrial origin in their nuclear genome. However, this is only true for a few genes. Studies indicate that humans and mice have only 35% of mitochondrial gene products that are similar to bacteria Rickettsia. Remaining mitochondrial proteins are derived from either non-mitochondrial nuclear genes or as a result of horizontal gene transfer events. Mitochondria have developed different states during the evolution of eukaryotic cell. Aerobic mitochondria retain a small mtDNA while anaerobic mitochondria and hydrogen-producing mitochondria alter the function of respiratory chain and also maintain mtDNA. Most animal mitochondrial genome obeys a specific genome composition. However, there are exceptions where variations have been observed. The genes of mtDNA are tightly packed together with minimal non-coding DNA. However, one large non-coding region called as D-loop, containing regulatory elements forShow MoreRelatedReproduction, Symbiosis, And Eukaryotic Cell Essay1621 Words   |  7 PagesHoly Martyrs Ferrahian High School Reproduction, Symbiosis, and the Eukaryotic Cell Research Paper Aram Kazorian AP Biology Mrs. Lee 18 October, 2016 The research that was conducted had the specific purpose of addressing questions on topics of individuality, reproduction, symbiotic relationships, all based around the idea of endosymbionts and the endosymbiotic theory with the eukaryotic cell. Symbiosis are the relationships between organisms that can either harm or benefit themselvesRead MoreThe Theory Of The Serial Endosymbiotic Theory1590 Words   |  7 Pagesfirst eukaryotic (an organism which contains a nucleus and organelles enclosed within a membrane ). Was pioneered in the 1960’s by the seminal work of Lynn Margulis. This theory attempts to explain the origins of eukaryotic cell organelles, specifically the mitochondria (providing the cells ATP (used for the cells metabolism) supply used by the cell as chemical energy ). With the theory suggesting that the mitochondria and plastids within a eukaryotic cell were once independent prokaryotic cells (aRead MoreEukaryotic Of Eukaryotic And Eukaryotic Genomes986 Words   |  4 Pagesthe prokaryotic domain of life, while humans and most other readily visible life forms are firmly rooted in the eukaryotic domain. These domains diverged many millions of years ago from a common ancestor and, while the eukaryotic branch later split into eukaryotic and archaeal domains, it maintained its separation from the prokaryotic domain (Woese et al., 1990). Prokaryotic and eukaryotic genomes are naturally very distinct in both content and structure as a result of eons-long separation, and oneRead MoreImportance Of Intracellular Bound Nucleus And Organelles Within Eukaryotes1615 Words   |  7 Pagesannotated diagrams where appropriate, membrane-bound nucleus and organelles within eukaryotes cells; explain evolutionary advantages of intracellular compartmentalization. Living cells are the functional biological building blocks of animals. They come together to form complex organic tissues, organs, and whole bodies, as well as some of these organisms themselves existing in a unicellular form. Cells vary in size and dimension, with Eukaryotes ranging from 1x10-3m to 1x10-4m in length, whilstRead MoreBiology: The Endosymbiotic Theory Essay example580 Words   |  3 Pagesinside the host cell some victims continued to thrive and grow. The theory of Endosymbiosis describes the origin of chloroplasts and mitochondria and their double membranes. This concept explains the idea that chloroplasts and mitochondria are the results of years of evolution started by endocytosis of bacteria and blue green algae. Based on this theory, blue green algae and bacteria are not digested but they are symbiotic To know this endocytosis is when a substance enters a cell without accessingRead MoreBiology : The Scientific Study Of Life1617 Words   |  7 Pagesthe environment, reproduction, and evolution; these properties are the basis in which we use to determine whether or not something is â€Å"alive† or â€Å"living.† Cells are the composition of all life. Every living thing on our planet is made up of thousands of cells. Within the properties of life, Order states that all living things exhibit a complex, but ordered organization. Organisms consist of many cells that are highly organized and coordinated. Within each cell, atoms, which are the smallest unitRead MoreEssay on Endosymbiosis1045 Words   |  5 Pagestheory that eukaryotic cells were formed when a prokaryotic cell ingested some aerobic bacteria. The first step of the evolution of a eukaryotic cell is the infolding of the cellular membrane. This process takes place when the plasma membrane folds inwards and develops an envelope around a smaller prokaryotic cell. Once the smaller cell is engulfed, it becomes dependent upon its host cell. It relies on the host cell for organic molecules and inorganic compounds. However, the host cell also benefitsRead MoreThe Theories Of Virus Origin1615 Words   |  7 Pagescannot reproduce withou t the help of a host cell, and do not use the normal cell-division process, mitosis, for replication. How did these entities arise and where did they come from? How did they evolve in this ever-changing world to still exist and be so prosperous? In my research I found three theories of virus origin; the theories include the progressive hypothesis, the regressive hypothesis, and the virus-first hypothesis. Investigations of their evolution have revealed many characteristics thatRead MoreThe Between Prokaryotic And Evolution Of Cells And Organisms With Novel Capabilities Essay812 Words   |  4 PagesEssay topic: Symbioses between Prokaryotic cells that happened approximately 2 billion years ago are thought to be at the origin of Eukaryotes. But mutually dependent symbioses continue to be established at the cellular and organism levels. Read the section on the origin of Eukaryotes in the unit’s prescribed textbook and use the reference below to research and describe the import ance of symbioses in the origin and evolution of cells and organisms with novel capabilities. Student and ID SymbiosisRead MoreThe Differences Between Prokaryotic and Eukaryotic Organisms Essay1696 Words   |  7 Pagesprokaryotic and eukaryotic organisms and explore the reasoning behind such differences with regard to general structure, storage of deoxyribonucleic acid (DNA) and its replication, metabolic processes, protein synthesis and ribonucleic acid (RNA) processing. The cell is the most basic unit of life, defined as â€Å"The fundamental ... structural and functional unit of all living organisms† (Oxford University Press, 2008). The prokaryotic cell is typically composed of a plasma membrane and cell wall, containing