IB Biology Cell Membrane

Scientists ______________and ___________discovered through experiments on RBC that the cell membrane is actually made up of a phospholipid bilayer

• Daveson and Danelli

• Singer and Niolson

• Gorter and Grendel

Hydrophilic means

• water repelling

• water attracting

• no water

• none of the above

Hydrophobic refers to

• water repelling

• water attraction

• none of the above

The sandwich model, is a phospholipid bilayer between two layers of ______________was suggested by ____________________ scientists

• proteins, Gorter and Grendel

• lipids, Gorter and Grendel

• proteins, Singer and Nicolson

• proteins, Daveson and Danelli

The fluid mosaic model suggests that ___________ are dispersed individually inserted into the phospholipid bilayer was suggested by scientists

• proteins, Gorter and Grendel

• lipids, Gorter and Grendel

• proteins, Singer and Nicolson

• proteins, Daveson and Danelli

A method of preparing electron microscopy called ________________________ splits the membrane along the middle of the phospholipid bilayer

• Freeze Frame

• Freeze Fracture

• Fracture Freeze

• Crystallography

The steroid cholesterol that is wedged between phospholipid molecules can be thought of as a ______________buffer

• temperature

• protein

• movement

In relatively warm temperatures, cholesterol makes the membrane _____________by ____________the movement of phospholipds

• more fluid, moving

• less fluid, restraining

• does nothing

Membranes must be ____________to work properly

• rigid

• hard

• fluid

• soft

Integral proteins penetrate the ______________________ core of the lipid bilayer.

• hydrophilic

• protein

• hydrophobic

• all of the membrane