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Lecture 12

Lec12 Questions.docx

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University of Toronto Scarborough
Biological Sciences
Shelley A.Brunt

Lec12 Questions Slide 31 1. phospholipid molecules are derived from glycerol except for sphingomyelin, which is derived from serine a. this information does not match the diagram on slide i. serine is the PRECURSOR, but choline is in the final product. Slide 33 2. what are linkers a. proteins that attach cells together, attach membrane to cytoskeleton, and cells to extracellular matrix i. e.g. desmosomes Slide 47 3. how does the beta barrel transverse the membrane? a. its not entirely hydrophobic 4. what you see for beta sheet structure is each amino acid is in an adjacent position a. what does this mean? i. amino acids arranged on beta sheets are rolled up to make a barrel ii. dual layered 1. by alternating the hydrophobic and hydrophilic elements, creates this dual layer a. hydrophobic facing outward b. hydrophilic facing inward i. facing inward to create hydrophilic environment
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