Below is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? H HO CH3 H- H CH3 H-C-H
Below is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? H HO CH3 H- H CH3 H-C-H
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Below is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell?
**Explanation of the Diagram:**
The image depicts the structural formula of cholesterol, a lipid molecule. The structure features:
1. **Fused Rings**: Four hydrocarbon rings (three with six carbons, one with five), typical of sterols.
2. **Hydroxyl Group (-OH)**: Attached to one end of the structure, contributing to its amphipathic nature.
3. **Alkyl Side Chain**: Extending from one of the rings, further classifying it as a cholesterol molecule.
**Functions in the Plasma Membrane:**
- **Membrane Fluidity**: Cholesterol maintains optimal fluidity, preventing membranes from becoming too rigid or too fluid.
- **Structural Integrity**: It provides stability and strength to cell membranes.
- **Permeability Barrier**: Cholesterol helps regulate the permeability of the membrane to small molecules.
Cholesterol is essential for proper membrane functioning, especially in eukaryotic cells.
Expert Solution
Introduction
The biological membrane that surrounds a living cell is called the cell membrane. The structure of the cell membrane is described as a lipid bilayer with proteins embedded in it
Lipids are a chemically diverse group with two common characteristics: low solubility in water and polar solvent and high solubility in non-polar solvents.
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