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Molecules and Cells Exam 2
key terms
11
Biology
Undergraduate 1
05/08/2012

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Term
carbohydrate energy storage
Definition
alpha linkages in starch and glycogen are readily hydrolyzed
beta linkages of structural carbohydrates resist enzymatic degradation
Term
membrane functions
Definition
keep damaging materials out of cell
allow entry of materials needed by cell
facilitate chemical reactions necessary for life
Term
membrane functions
Definition
keep damaging materials out of cell
allow entry of materials needed by cell
facilitate chemical reactions necessary for life
Term
membrane functions
Definition
keep damaging materials out of cell
allow entry of materials needed by cell
facilitate chemical reactions necessary for life
Term
key building blocks of lipids
Definition
fatty acids and isoprene
Term
3 types of lipids found in cells
Definition
fats = 3 fatty acids linked to glycerol (triglyceride)
steroids- 4 ring structure (cholesterol)
phospholipids- glycerol linked to a phosphate group and to either two chains of isoprene or two fatty acid tails
Term
four key differences between eukaryotic and prokaryotic cells
Definition
eukaryotic chromosomes are found inside a nucleus
eukaryotic cells are often much larger
eukaryotic cells contain extensive amounts of internal membrane
eukaryotic cells feature a diverse and dynamic cytoskeleton
Term
tight junctions
Definition
two cells "stitched" together to form watertight seal
usually found in tissues that form a barrier
Term
desmosomes
Definition
made of proteins that link cytoskeletons of adjacent cells
adhering spots
Term
plasmodesmata
Definition
plants
gaps in cell wall where plasma membranes, cytoplasm, and smooth ER of two cells connect
Term
gap junctions
Definition
connect adjacent cel by forming channels that allow flow of small molecules between cells
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