Plasma Membrane

Question 1

Structure of the Bilayer

Answer 1

Phosphate head (hydrophilic) Fatty acid tail (hydrophobic tail)

Question 2

Integral Proteins

Answer 2

Inside the membrane. Can interact with lipid tails and water. Can be transport channels, enzymes or receptors

Question 3

Peripheral Proteins

Answer 3

Attached to integral proteins

Question 4

Proteins move across the membrane.

Answer 4

Transport

Question 5

Chemical messengers bind to the protein and may change the shape.

Answer 5

Receptors for signal transduction

Question 6

Structural components bind the the proteins and help to maintain the cells shape

Answer 6

Attachment to the cytoskeleton

Question 7

Act as enzymes

Answer 7

Enzymatic activity

Question 8

CAMs

Answer 8

Cell adhesion molecule

Question 9

Membrane proteins of adjacent cells may join to exchange material

Answer 9

Intercellular joining

Question 10

protein act as cell “name tags”

Answer 10

Cell to cell recognition

Question 11

Sugar covering at cells surface. Allows the immune system to recognize the type of cells

Answer 11

Glycocalyx

Question 12

Adjacent integral proteins fuse

Answer 12

Tight Junctions

Question 13

Thickenings on plasma membrane

Answer 13

Plaques

Question 14

Velcro-like junctions. Gives stability to cells

Answer 14

Desmosomes

Question 15

Formed pores that allow molecules to pass from cell to cell

Answer 15

Gap junctions

Question 16

What is osmosis

Answer 16

The movement of water across selectively permeable membrane (goes from high concentration to low)

Question 17

Ability of Solution to alter cells water volume

Answer 17

Tonicity