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unit 2 db notes - (2006 compares the plasma membrane to the...

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3. Eukaryotic cells (in plants, animals, fungi, and algae) are bigger than prokaryotic (bacterial) cells. This bigger size allows eukaryotic cells to have more structural complexity. Choose any one of the following eukaryotic cell structures for a short essay: Mitochondrion Cytoskeleton Golgi apparatus Endoplasmic reticulum Lysosome Chloroplast (found only in photosynthetic cells) In your answer, describe its basic structure (including molecular composition) as well as the function. Why is the function important to keeping the cell alive? Plasma serves 4 functions: 1. Isolate the cell cytoplasm from the external environment 2. Regulate the exchange of substance between the cytoplasm and the external environment 3. Communicate with other cells 4. Identify the cell as a particular type in a particular species Plasma is the outer layer of a cell and is used to hold the cell together. Starr
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Unformatted text preview: (2006) compares the plasma membrane to the structure of a house: It keeps all of the components inside of it safe and only lets what is invited inside the house through doors or windows. • Prokaryotic and eukaryotic cells both possess a plasma membrane surrounding the cytoplasm. Prokaryotic cells are smaller and simpler than eukaryotic cells. Eukaryotic cells posses several membranous organelles in a cytoplasm, and a membrane-bound nucleus. • Cells are limited in size because they must exchange materials with their surroundings by diffusion. Because diffusion is relatively slow, the interior of the cell must never me to far from the plasma membrane, and the plasma membrane must have a large surface area through which materials can diffuse relative to the volume of cytoplasm. Both of these constraints limit the size of cells. •...
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