The Cell Membrane, Wall and Endomembrane System

Name: The Cell Membrane, Wall and Endomembrane System
Author: StemPy Lab

The fluid mosaic model of the cell membrane and how things cross it, the plant cell wall, and the endomembrane system: endoplasmic reticulum, Golgi apparatus, lysosomes and vacuoles.

3 lessons, about 1 h 15 min3 simulations10 problems3 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 25 min
The cell membrane
The cell membrane is a lipid bilayer with polar heads outwards and hydrophobic tails inwards, mostly phosphoglycerides, with cholesterol, proteins and carbohydrates. The red blood cell membrane is about 52 per cent protein and 40 per cent lipid. In the fluid mosaic model of Singer and Nicolson (1972), proteins move in a quasi-fluid lipid layer. Water crosses by osmosis; the Na+/K+ pump uses ATP.
1 simulation1 practice question1 Python program4 problems1 Python lab
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Lesson 2about 25 min
The cell wall
The cell wall is a non-living, rigid layer outside the plasma membrane of fungi and plants. It gives shape, protects the cell, helps cells interact and keeps out unwanted large molecules. Algal walls hold cellulose, galactans, mannans and calcium carbonate; plant walls hold cellulose, hemicellulose, pectins and proteins. A primary wall grows; a secondary wall forms inside it. The middle lamella of calcium pectate glues cells; plasmodesmata join them.
1 simulation1 practice question1 Python program3 problems
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Lesson 3about 25 min
The endomembrane system
The endomembrane system is the ER, the Golgi complex, lysosomes and vacuoles, whose functions are coordinated; mitochondria, chloroplasts and peroxisomes are not part of it. Rough ER makes and sends out proteins; smooth ER makes lipids and steroid hormones. The Golgi apparatus (Camillo Golgi, 1898) has a cis face and a trans face, packages materials and forms glycoproteins and glycolipids. Lysosomes hold hydrolases active at acidic pH; vacuoles are bound by the tonoplast.
1 simulation1 practice question1 Python program3 problems1 Python lab1 question set1 note
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The Cell Membrane and Endomembrane System: NEET Style Test

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More onCell Biology › Cell Structure and Organelles Cell Biology › Transport Across the Cell Membrane

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The Cell Membrane, Wall and Endomembrane System

Course outline (3 lessons)

The cell membrane

The cell wall

The endomembrane system

Test Your Learning

Your teacher

Discussion (0)