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IB Biology: Level 6 - Structure of the Cell Membrane 1.3

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Total cards: 10•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (10)

#1
Front (Question)

Essential idea

Back (Answer)

The structure of biological membranes makes them fluid and dynamic

#2
Front (Question)

Nature of science

Back (Answer)

Using models to represent the real world.Falsifying theories with one theory being superseded by another.

#3
Front (Question)

Extracellular space

Back (Answer)

Space outside of the cell the cell

#4
Front (Question)

Phospholipid molecules

Back (Answer)

Major component of the cell.

#5
Front (Question)

Amphiphilic

Back (Answer)

describing a chemical compound possessing both hydrophilic (water-loving, polar) and hypophobic (water-fearing)

#6
Front (Question)

Phospholipid structure

Back (Answer)

Phosphate head (polar/ hydrophilic)GlycerolLipophilic |fatty acid| tails (non-polar/ hydrophobic)

#7
Front (Question)

Gorter - Grendel Model

Back (Answer)

States that cell membrane is made of a lipid bilayer

#8
Front (Question)

Davson - Danielli Model

Back (Answer)

• A protein-lipid sandwich-Lipid bilayer composed of phospholipids (head and tail)- Protein coat outer surface- Proteins do not permeate the lipid bilayer

#9
Front (Question)

Davson - Danielli Model’s evidence

Back (Answer)

Electron micrographs membranes appeared as two dark parallel lines with a lighter coloured region in betweenProteins appear dark and phospholipids appear light

#10
Front (Question)

Falsification of Davson-Danielli model

Back (Answer)

• Fracture occurs along lines of weakness, including centre of membranes- Fracture reveals rough surface inside phospholipids bilayer- The globular structures are trans-membrane proteins