Transport across cell membrance

What is the function of the cell membrane?

• regulate the movement of molecules into and out of the cell

• protect the cell from pathogens

• provide structure to the cell

• contain the genetic information of the cell

The membrane is considered to be __________.

• structurally integral to the cell

• selectively permeable

• full permeable

• integral to cellular respiration

Which molecules from the list below CAN diffuse across the cell membrane?

• H2O

• CO2

• O2

• Na+

• protein

The cell membrane is a phospholipid bilayer with embedded proteins. It is said to resemble a __________.

• sandwich

• twisted ladder

• mosaic pattern

• pleated sheet

Carbohydrate chains that are attached to the membrane proteins are called:

• glycolipids

• glycoproteins

• polysaccharides

• glyco-aminos

Glycoproteins and glycolipids give each cell a unique _________.

• fingerprint

• immunity

• size

• ability to reproduce

Passive transport in the cell never requires:

• energy

• carrier proteins

• channel proteins

• solute diffusion

Diffusion results in molecules moving from:

• areas of high concentration

  to

  areas of low concentration

• areas of low concentration

  to

  areas of high concentration

• areas of low energy

  to

  areas of high energy

• areas of high energy

  to

  areas of low energy

Diffusion occurs

• with the concentration gradient

• in the opposite direction of the concentration gradient

diffusion is the ___________ toward equilibrium.

• movement of solutes

• movement of solvent

• movement of solution

• movement of water