Understanding Cell Membranes

What are the ideal properties of a cell membrane?

• Sturdy and inflexible

• Flexible and leaky

• Sturdy and flexible

• Inflexible and non-porous

Who first observed differences in how detergents dissolve grease?

• Agnes Pockels

• Katharine Blodgett

• Charles Overton

• Irving Langmuir

What did Langmuir and Blodgett discover about oil molecules?

• They form a single layer on water

• They dissolve completely in water

• They do not interact with water

• They form multiple layers on water

What substances are cell membranes primarily composed of?

• Lipids

• Nucleic acids

• Carbohydrates

• Proteins

What did Gorter and Grendel use to test the structure of cell membranes?

• Metal trays

• Lipid extracts

• Soapy films

• Water layers

What animal was NOT used in Gorter and Grendel's experiment?

• Rabbit

• Goat

• Dog

• Cat

Tags

CCSS.RI.6.7

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RL.6.7

CCSS.RL.7.7

What analogy is used to explain the Gorter and Grendel experiment?

• Splitting a cookie

• Opening a sandwich

• Unfolding a map

• Opening a book

What did the Gorter and Grendel experiment prove about cell membranes?

• They are a single layer

• They are a triple layer

• They are a bilayer

• They are fully permeable

What ratio did Gorter and Grendel observe in their experiment?

• Three-to-one

• Four-to-one

• Two-to-one

• One-to-one

What was a key outcome of the Gorter and Grendel experiment regarding cell membranes?

• Introduced the concept of lipids

• Confirmed the presence of proteins

• Disproved the bilayer theory

• Confirmed the bilayer structure