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Cell Organelles- Chloroplast and Vacuole

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Maite Llorente

on 8 October 2012

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Transcript of Cell Organelles- Chloroplast and Vacuole

The Cell: basic unit of life. The cell is the smallest level of life, it can be classified in prokaryotic and eukaryotic and in eukaryotic animal or plant cell. However all of them have organelles, little organs in the cell that carry out its functions. The organelles in the eukaryotic cells though are more complex than in the prokaryotic. Plant cells have different organelles than animal cells. The VACUOLE The CHLOROPLAST It is found in both animal and plant cells, but they are larger in plant cells. Vacuoles are storage bubbles found in cells. They are found in both animal and plant cells but are much larger in plant cells. Vacuoles might store food or any variety of nutrients a cell might need to survive. The structure of vacuoles is fairly simple. There is a membrane that surrounds a mass of fluid. In that fluid are nutrients or waste products. Plants may also use vacuoles to store water. STRUCTURE FUNCTION www.biology4kids.com We said that chlorophyll molecules sit on the outside of the thylakoid sacs. Not all chlorophyll is the same. Three types of chlorophyll can complete photosynthesis. There are even molecules other than chlorophyll that are photosynthetic. For example: carotenoids, phycocyanin (bacteria), phycoerythrin (algae), and fucoxanthin (brown algae). While those compounds might complete photosynthesis, they are not all green or the same structure as chlorophyll. Different Chlorophyll Molecules Vacuoles also play an important role in plant structure. Plants use cell walls to provide support and surround cells. The size of that cell may still increase or decrease depending on how much water is present. Plant cells do not shrink because of changes in the amount of cytoplasm. Most of a plant cell's volume depends on the material in vacuoles. Helping with Support SEM of a chloroplast TEM of a chloroplast chloroplasts under
light microscope They are only found in plant cells Their function is to produce the cell’s food.
They convert the energy from the Sun into sugars.
This process is called photosynthesis. FUNCTION www.cellsalive.com The main functions of the vacuole are:
Isolating materials that might be harmful or a threat to the cell
Containing waste products
Containing water in plant cells
Maintaining internal hydrostatic pressure or turgor within the cell
Maintaining an acidic internal pH
Containing small molecules
Exporting unwanted substances from the cell
Allows plants to support structures such as leaves and flowers due to the pressure of the central vacuole
In seeds, stored proteins needed for germination are kept in 'protein bodies', which are modified vacuoles www.wikipedia.com INTERACTION WITH
OTHER ORGANELLES The vacuole interacts with other organelles such as the endoplasmic reticulum and golgi apparatus. INTERESTING FACTS Some vacuoles have color pigments that give the flowers their characteristic color. www.micro.magnet.fsu.edu SOURCES STRUCTURE THE END vacuole under light microscope TEM of a vacuole SEM of a vacuole diagram by www.braingenie.com www.braingenie.com
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