Clicker_questions_on_carbohydrates__lipi

Clicker_questions_on_carbohydrates__lipi - Clicker...

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Clicker questions on carbohydrates, lipids and cell structure to nucleus
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Why do animal cells often attach carbohydrates to proteins on their cell surfaces? A. The cell surface needs a local source of energy to hold it together. B. Glycoproteins have a lot more diversity in structures than do proteins alone. C. The carbohydrates are stored there as food to be taken in later. D. They need the hydrophilic environment out there.
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B. It is very important for a cell to recognize other cells and their environment in general and for that they need specificity. Specificity from unique integral and peripheral proteins is good but a cell gets a lot more diversity by having unique polysaccharides on their glycoproteins (and glycolipids). Glucose is only used, can be only used, as energy or in construction of polysaccharides within the cytoplasm of the cell. There is no local source of energy outside the cell; in fact ATP is not used out there either. Cells store glucose within the cell as starch in plants or glycogen in animals. Both inside and outside are hydrophilic environments so the cell surface is nothing special for dissolving carbohyrates.
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Glucose and galactose sugars have the same chemical formula, C6H12O6. How are they different? a. They are different in molecular weight. b. Glucose is a hexose but galactose is a pentose sugar. c. Only galactose could form alpha and beta isomeric ring forms. d. Only glucose is a polyhydroxylic hydrocarbon. e. They are different isomeric forms.
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E. They are only different in the arrangement of the same C, H and O in space (i.e. structural isomers).
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A correct match of polysaccharide and role of that polysaccharide is:
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This note was uploaded on 02/03/2012 for the course BS 111 taught by Professor Patterson during the Spring '05 term at Michigan State University.

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Clicker_questions_on_carbohydrates__lipi - Clicker...

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