Biology Study Guide Ch. 4

Question 0

Distinguish between the roles of the various integral proteins in the plasma membrane.

Answer 0

Channel proteins, carrier proteins, cell recognition proteins, receptor proteins and enzymatic proteins.

Question 1

Describe the role of proteins, steroids, and phospholipids in the fluid-mosaic model.

Answer 1

A

Question 2

Contrast diffusion with facilitated transport.

Answer 2

Diffusion is the movement of molecules from a higher to lower concentration. Facilitated transport is movement with the help of carrier proteins.

Question 3

Describe the difference between facilitated and active transport.

Answer 3

Facilitated does not require use of energy, active requires the use of energy.

Question 4

Describe the molecule composition of the extra cellular matrix (ECM) of an animal cell.

Answer 4

Collagen and elastin have a support function, while fibronectins bind to integrin.