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A) molecules pass directly through the phospholipid bilayer of the plasma membrane. B )molecules move across the plasma membrane without an input of energy. C) the plasma membrane folds inward to form a vesicle containing extracellular material. D) molecules move through transport proteins that have been activated by ATP.
a. Leak channels allow sodium and potassium to move across the membrane, causing the difference in electric charge. b. The cell membrane is impermeable to sodium and potassium. c. The concentrations of sodium and potassium are not equal inside and outside the cell. d. The cell is more negative outside than inside. c.
Terms in this set (13) What is the best description of the cell's plasma membrane? It regulates exchange with the exterior. It has a phospholipid bilayer. It is its outermost boundary. All of these are true of a cell's plasma membrane. Interstitial fluid; cytoplasm. The plasma membrane separates the __________ from the __________. Phospholipid ...
This cell membrane provides a protective barrier around the cell and regulates which materials can pass in or out. Structure and Composition of the Cell Membrane. The cell membrane is an extremely pliable structure composed primarily of two layers of phospholipids (a “bilayer”). Cholesterol and various proteins are also embedded within the ...
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
- Definition
- Function of The Cell Membrane
- Phospholipid Bilayer
The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell. It separates the cytoplasm (the contents of the cell) from the external environment. It is a feature of all cells, both prokaryotic and eukaryotic.
The cell membrane gives the cell its structure and regulates the materials that enter and leave the cell. It is a selectively permeable barrier, meaning it allows some substances to cross, but not others. Like a drawbridge intended to protect a castle and keep out enemies, the cell membrane only allows certain molecules to enter or exit.
The cell membrane is made up of a phospholipid bilayer. Phospholipids are lipid molecules made up of a phosphate group head and two fatty acid tails. Importantly, the properties of phospholipid molecules allow them to spontaneously form a double-layered membrane. The phosphate group head of a phospholipid is hydrophilic, whereas the phospholipid ta...
Cell and Molecular Biology. Book: Cells - Molecules and Mechanisms (Wong) E. V. Wong. Axolotl Academica Publishing. Biological membranes are the basis for many important properties of the cell, not the least of which is to physically define the cell boundary, and in eukaryotes, the boundaries of each intracellular ….
Feb 24, 2023 · Figure 3.2.1 3.2. 1: Phospholipid Structure A phospholipid molecule consists of a polar phosphate “head,” which is hydrophilic and a non-polar lipid “tail,” which is hydrophobic. Unsaturated fatty acids result in kinks in the hydrophobic tails. The cell membrane consists of two adjacent layers of phospholipids.
