15 - 9/15/10 1. Organelles in the endo-membrane system 2....

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1 9/15/10 1. Organelles in the endo-membrane system 2. Energy transformation organelles 3. Cytoskeleton 4. Harvard’s “Inner Life of the Cell” animation Homework questions to be posted on Blackboard, mult-choice q’s, answer online by Mon. Sept 20 Next Monday, extra preparation for Exam 1: Buskirk Q&A session 5-6 pm in PAI 2.48 I will be at study tables Monday evening: 7:30 pm JES 8:30 pm KIN Tying together the protein story and the cell story: 1. Many membrane proteins have a chain of sugar groups on their external face. 2. Many proteins are put into their “active” form (able to do cell work) when ATP is used to add a phosphate group to them. Chaperones aid protein folding Unfolded protein enters chaperone complex . . . Properly folded protein is released! If a protein is to be secreted out of the cell, will it be made at which? at a ‘free’ ribosome (loose in the cytosol) Or at a ‘bound’ ribosome (temporarily bound to the ER)?
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15 - 9/15/10 1. Organelles in the endo-membrane system 2....

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