Most molecules that are transported through a cell membrane pass through what type of channel? fatty acid tails transport proteins peptidoglycan flagellin chitin
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Which of the following membrane proteins may serve as channels for the passage of molecules across the membrane? - Integral membrane proteins - Prenylated proteins - Peripheral proteins - Fatty acylated proteins
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For each of the following sentences, fill in the blanks with the best word or phrase. Words or phrases will be used only once. The specialized functions of different membranes are largely determined by the lipids they contain. Membrane lipids are molecules composed of a hydrophilic portion and a hydrophobic portion. All cell membranes have the same structure with the phospholipids facing into the interior of the membrane and the hydrophilic head groups on the outside. The most common lipids in most cell membranes are phospholipids. The head group of a glycolipid is composed of sugars. For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. A molecule moves down its concentration gradient by passive transport, but requires active transport to move up its concentration gradient. Transporter proteins and ion channels function in membrane transport by providing a pathway through the membrane for specific polar solutes or inorganic ions. They are highly selective in the solutes they transport, binding the solute at a specific site and changing conformation so as to transport the solute across the membrane. On the other hand, ion channels discriminate between solutes mainly on the basis of size and electrical charge.
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What cell membrane structure allows water-soluble materials to be passively transported to the cytoplasm? A. Endocytosis vesicles B. Carrier proteins C. Hydrophilic phospholipid tails D. Golgi complex vesicles
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