Keywords 2.0 (Cells)

Question 1

Phospholipid bilayer

Answer 1

A double layer of phospholipids that forms the majority of biological membranes. The phospholipids are arranged with hydrophobic tails facing inwards and phosphate heads on the outside.

Question 2

Fluid-mosaic model

Answer 2

The arrangement of different molecules including a phospholipid bilayer, cholestrol and protein molecules to form biological membranes.

Question 3

Cholestrol

Answer 3

A lipid molecule that adds strength and some rigidity by pulling together phospholipids molecules to limit their movements.

Question 4

Co-transport

Answer 4

The transport of one substance coupled with the transport of another substance across a plasma membrane in the same direction using a protein carrier.

Question 5

Microvilli

Answer 5

Tiny finger-like projections of membrane and cytoplasm from a surface of a cell. They greatly increase the surface area of the cell to increase the rate of exchange.

Question 6

Osmosis

Answer 6

The net movement of water from a high ψ to a region of lower ψ across a partially permeable membrane until an equilibrium is reached.