Multiple Choice
Why does the phospholipid bilayer form the way it does in biological membranes?
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6. The Membrane
Biological Membranes
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How do phospholipids contribute to the structure of cell membranes?
A
They form a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward.
B
They act as enzymes to facilitate biochemical reactions within the membrane.
C
They provide energy for active transport processes across the membrane.
D
They create a rigid structure that prevents any movement of molecules across the membrane.
Verified step by step guidance1
Understand the basic structure of phospholipids: Phospholipids are composed of a hydrophilic (water-attracting) 'head' and two hydrophobic (water-repelling) 'tails'.
Recognize the arrangement of phospholipids in a cell membrane: In an aqueous environment, phospholipids arrange themselves into a bilayer, with the hydrophobic tails facing inward, shielded from water, and the hydrophilic heads facing outward, interacting with the aqueous environment.
Identify the role of the phospholipid bilayer: This arrangement forms the fundamental structure of cell membranes, creating a semi-permeable barrier that separates the interior of the cell from the external environment.
Differentiate the functions of phospholipids from other membrane components: While phospholipids form the structural basis of the membrane, proteins embedded within the membrane perform various functions such as transport, signaling, and acting as enzymes.
Clarify misconceptions: Phospholipids do not act as enzymes, provide energy, or create a rigid structure. Instead, they contribute to the fluidity and flexibility of the membrane, allowing for the movement of molecules and the dynamic nature of the cell membrane.
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