Extracellular Components & connections

Question 1

Function of extracellular components and connectios between cells

Answer 1

To help coordinate cellular activities

Question 2

Extracellular structures include

Answer 2

Cell walls of plants
Extracellular matrix ECM
Intercellular junctions

Question 3

Functions of ECM

Answer 3

Support
Adhesion
Movement
Regulation

Question 4

Animals lack cell walls true or false

Answer 4

True, they are instead covered by an elaborate extracellular matrix

Question 5

EMC is made up of

Answer 5

Glycoproteins such as
Collagen
Proteoglycans
Fibronectin

Question 6

Integrins

Answer 6

Extracellular matrix proteins bind to receptor proteins in the plasma membrane.

Question 7

Cell junctions

Answer 7

Tight junctions
Desmosomes
Gap junctions

Question 8

Tight junctions ?

Answer 8

Membranes of neighboring cells are pressed together, preventing leakage of extracellular fluid

Question 9

Desmosomes

Answer 9

(Anchoring junctions )fasten cells together into strong sheets

Question 10

Gap junctions

Answer 10

(Communicating junctions)

Provide cytoplasmic channels between adjacent cells

Question 11

Cell wall is ?

Answer 11

An extracellular structure That distinguishes plant cells from animal cells

Question 12

Plant cell walls are made of ?

Answer 12

Cellulose fibers embedded in other polysaccharides and protein

Question 13

Layers of cell wall?

Answer 13

Primary cell wall
Middle lamella
Secondary cell wall

Question 14

Primary cell wall?

Answer 14

Relatively thin and flexible

Question 15

Middle lamella ?

Answer 15

Thin layer between primary walls of adjacent cells

Question 16

Secondary cell wall ?

Answer 16

Added between the plasma membrane and the primary cell wall

Question 17

Plasmodesmata ?

Answer 17

Channels between adjacent plant cells

• channels that perforate plant cell walls
• through plasmodesmata, water and small solutes (sometimes proteins and RNA) can pass from cell to cell

Question 18

Amphipathic

Answer 18

Containing both hydrophobic and hydrophilic amino acids