The prokaryotic cell that was able to perform aerobic respiration is the ancestor of the mitochondria, and the cell that was able to perform photosynthesis is the ancestor of the chloroplast. Previous ib exam essay questions: unit 1 use these model essay question responses to prepare for essay questions on your in class tests, as well as the ib examination, paper 2 these questions have appeared on recent ib examinations, exactly as shown below. For example, the first observations of cells were made in the 1600s, but cell theory was not postulated until 200 years later — so in this case, the evidence actually helped inspire the idea whether the idea comes first or the evidence comes first, the logic relating them remains the same. Anton van leeuwenhoek was the first to see and describe bacteria (1674), yeast plants, the teeming life in a drop of water, and the circulation of blood corpuscles in capillaries during a long life he used his lenses to make pioneer studies on an extraordinary variety of things, both living and non-living, and reported his findings in over a.
1) using evidence from today's lesson, please explain what the cell theory states 2) what observations did you make during the microscope activity that provides evidence for what the cell theory states. Evidence to support or challenge the theory you will need to organise the essay to first explain the theory and then to consider evidence for and evidence against before drawing an overall conclusion, so the above grid isn't an essay plan - it's. Cell theory is the theory that all living things are composed of cells and come from preexisting cells robert hooke's observation of a thin slice of cork and his conclusion that life's smallest structural units were little boxes or cells gave cell theory a start. According to the endosymbiotic theory, some organelles are believed to have evolved through a symbiotic relationship between eukaryotic and prokaryotic cells describe three observations that support the endosymbiotic theory.
Here's a brief summary of the evidence that supports the theory of evolution by natural selection: biochemistry is the study of the basic chemistry and processes that occur in cells the biochemistry of all living things on earth is incredibly similar, showing that all of earth's organisms share a common ancestry. Criminological theory and legal theory - criminological theory rational choice rational choice is based on the presumption that crime is a personal choice and that people can freely choose to participate in such criminal activity based on the outcomes, whether it be negative or positive. The cell theory holds true for all living things, no matter how big or small, or how simple or complex since according to research, cells are common to all living things, they can provide information about all life.
An evidence to this theory is the presence of dna in mitochondria and chloroplasts, which is a hint that, somewhere in the long lost past, they were cells themselves jotomicron 1 decade ago 2. The cell is the smallest functional unit of life all organisms are made up of cells cells come from pre-existing cells there is a large body of evidence to support these claims microscopic. Essay about describe evidence to support the cell theory composed of globules called cells robert brown enhanced this idea by describing the nuclei in cells of orchid plants.
Describe evidence to support the cell theory essay sample by early 1800s, the accepted idea was that plants and animals were composed of globules called cells. Cancer stem-cell theory essay - clonogenic assays have shown that, though most cells in a tumor have a limited ability to proliferate, a subset of cancer cells exist in these tumors that continuously proliferate and give rise to new tumors on transplantation. The theory of evolution is a fact and the theory has only been strengthened as more evidence has been accrued this is a complete overview of the most direct evidence in support of. The theory that explains how this could have happened is called endosymbiotic theory an endosymbiont is one organism that lives inside of another one all eukaryotic cells, like your own, are creatures that are made up of the parts of other creatures.
In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. The cell theory holds that all living matter, from the simplest of unicellular organisms to very complex higher plants and animals, is composed of cells and that each cell can act independently. Cell theory- all organisms are made of one or more cells and the products of those cells an organism may be a single cell, such as a bacterium, or many cells organized to function together as in an animal or plant.
Cell theory is one of the foundations of biologythe observations of hooke, leeuwenhoek, schleiden, schwann, virchow, and others led to the development of the cell theory the cell theory is a widely accepted explanation of the relationship between cells and living things. However the eukaryotic cell arose, abundant evidence has accumulated that supports the endosymbiotic theory, and the evidence of similarities relating to different functions of bacteria and mitochondria are reviewed in this essay.
The big bang theory predicts how much of each element should have been made in the early universe, and what we see in very distant galaxies and old stars is just right you cannot look in new stars, like the sun, for this evidence, because they contain elements that were created in previous generations of stars. The endosymbiotic theory describes how a large host cell and ingested bacteria could easily become dependent on one another for survival, resulting in a permanent relationship over millions of years of evolution, mitochondria and chloroplasts have become more specialized and today they cannot live outside the cell. For example, new cells arise from cell division and a zygote (the very first cell formed when an organism is produced) arises from the fusion of an egg cell and a sperm cell 212 discuss the evidence for the cell theory.