Bio 211 EvCC Pottle Chapter 5 Study Guide Questions & Answers 2025 A+ Every cell has a(n) __________________ that allows it to maintain a cellular environment that is separate from the environment in which it is found. - ANS-plasma membrane Which of the following best describes the structure of a plasma membrane? a. Proteins sandwiched between two layers of phospholipids b. Proteins embedded in two layers of phospholipids c. A layer of protein on top of a layer of phospholipids d. Phospholipids sandwiched between two layers of protein - ANS-b. Biologists have described a cell's plasma membrane as being a fluid mosaic. Briefly explain why this is an accurate description. - ANS-This is an accurate description because a plasma membrane is made of multiple types of mol- ecules with many different functions (the mosaic) and the molecules are in constant motion around each other (fluid). True or false: The fact that all cells have a plasma membrane supports the evolutionary linkage of all life. If false, make it a correct statement. - ANS-True Diffusion of water across a selectively permeable membrane - ANS-Osmosis Movement across a cell membrane that requires no work from the cell - ANS-Passive transport Movement of a substance from high to low concentration - ANS-...
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