stomatal index (/density) than those taken from the centre of a shrub this are due to light levels. Explanation: Plants have stomata to obtain carbon dioxide from the atmosphere and remove oxygen produced in photosynthesis. During photosynthesis the chloroplasts in the leaf cells synthesize as a result of exposure to light‚ while oxygen is produced as a by-product. As the outer leafs are exposed to higher light levels the stomatal density has to be high and because the inner leaves are exposed to lower
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Life itself is amazing. It surrounds us on a daily basis from the ants in our window seal‚ the squirrels on the power line‚ to the bacteria we all have in our mouths and on our bodies. Life is indeed a gift. Every life that comes into this world is made up of cells‚ life of humans‚ plants‚ and animals. I know that to understand the nature of life we must first comprehend the cell‚ its parts‚ and organelles. There are two different types of cells‚ including prokaryotic and eukaryotic. Living bacteria
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dimension * Need for surface area explains the elongated nerve cells * Microvilli – long‚ thin projections (animal only) that increases SA and not volume Nucleus * Contains most of genes (other genes are located in mitochondria and chloroplast) * Nuclear envelope (lipid bilayer‚ double membrane): encloses nucleus and separates its contents from the cytoplasm * Pore complex: regulates entry/exit of proteins‚ RNAs and macromolecules * Nucleoplasm: the cytoplasm of the nucleus
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functions. Work Cited: http://biology.about.com/od/biologydictionary/g/cytoplasm.htm http://www.enchantedlearning.com/subjects/plants/cell/ http://www.biologyjunction.com/cell_functions.htm http://www.nature.com/scitable/topicpage/plant-cells-chloroplasts-and-cell-walls-14053956 The Cytoskeleton
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The cell wall is the tough‚ flexible but sometimes fairly rigid layer that surrounds some types of cells. It is located outside the cell membrane and provides these cells with structural support and protection. Just as the wall of the factory is for the factory. The wall also is the structure and strength. The cell membrane that separates the interior of all cells from the outside The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances
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cell wall * Store starch * Give rise to terrestrial plants a) Desmids- uni c (bananas) b) Spirogyra- filamentous; green strands c) Chlamydomonas- biflagellated; stigma d) Volvox- colonial alga; biflagellated e) Euglena- chloroplast| Algae: Stigma; 1 flagellum; pellicle| Proto: cystostome 4. Baccillariophyta / Diatoms * Cell wall: pectin and silica * Planktonic * Produces DOMOIC ACID * Sediments; diatomaceous earth 5. Dinophyta / Dinoflagellates
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The Index of Refraction was similar in each given medium and among the three mediums. This is obvious because (for example) in water‚ the indexes are all within 1.3 and for all three of the mediums there is a small range of 1.3-1.5 for the Index of Refraction. A light ray travelling from air to water will refract towards the normal more than a light ray travelling from water to air would. A light ray travelling from air to vegetable oil will refract towards the normal more than a light ray travelling
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Mitochondria are the energy factories of the cells. The energy currency for the work that animals must do is the energy-rich molecule adenosine triphosphate (ATP). The ATP is produced in the mitochondria using energy stored in food. Just as the chloroplasts in plants act as sugar factories for the supply of ordered molecules to the plant‚ the mitochondria in animals and plants act to produce the ordered ATP molecules as the energy supply for the processes of life. Rough endoplasmic reticulum- Rough
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Chapter 1 * animal Multicelled consumer with unwalled cells; develops through a series of stages and moves about during part or all of the life cycle. * archaean Member of a group of single-celled microorganisms that superficially resemble bacteria‚ but are genetically and structurally distinct. * atom Particle that is a fundamental building block of all matter. * bacterium Single-celled organism belonging to the Domain Bacteria; cells are typically walled and do not
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Nutritional requirements The composition of medium for the tissue culture is the most important key factor in the successful culture of plant cells. The medium should be accurately defined of inorganic and organic chemical additives so as to provide i) the nutrients for the survival of the plant cells‚ tissues and organs under culture and ii) the optimal physical condition of pH‚ osmotic pressure‚ etc. In the culture of plant cells formulating optimum type of medium favorable for in vitro
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